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Sectional-Coiling and Hangar Doors
Emergency Exit Devices
Frames - Hardware
Electric Operators
Dock Equipment
Store Front Doors
Hollow Metal Doors
Commercial and Industrial Doors

Glossary of Terms

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Access Panel Label Size
Accordion Grill Lift Handle
Adjusting Wheel Limit Switch
Air Infiltration Locking
Air Lock Set-up Locking Pawl (Pin)
Air Switch Loop Detector
AISC Magnetic Release
All Weather Door Magnetic Reversing Starter
Anodize Malleable Iron
Approved Equal Manual Override
ASHRAE Master Keying
ASTM Metric System
Astragal Midget Slat
Automatic Closing Mill Finish
B & S Motor By Others
Backroom Motor Cover
Barrel Assembly Mullion, Motorized
Barrel Ring Mullion, Removable
Bar Stops NBFU
Base Plate NEMA
Bellmouth NFPA
Best Locks NFPA 72, National Fire Alarm Code
Between Jamb Mounted NFPA 80, Standard for Fire Door and Fire Windows
Bi-Part Offset
Bonderizing Offset Bottom Bar
Bottom Bar Oil Tight
Bracket Plates Oscillation Governor
Brake, Dynamic Oversized Label
Brake, Electrical Packout
Brush Seals Paint Bond
Brush Weatherstripping Panic Release Device
"C" Factor Pass Door
Cable Sensor Edge Patterns, Grille
Card Key Pendant Switch
Center Hook Lock Perforated Slats
Center Throw Lock Photoelectric Type Smoke Detector
Chain Hoist Pipe Shaft
Charge Pin Plug End
Charge Wheel Pneumatic Sensor Edge
Class A, B, C, D Polycarbonate
Clear-vue Powder Coating
Coil-Cord Pre-Turns
Coiling Grille Prior Approval
Combo Starter/Combination Reversing Starter Pull Cord
Continuous Endlocks Push Button Station
Continuous Windlocks Quartzoid
Contractor "R" Value
Counter Shutter Reelite
Counterbalance Reversing Contactor
Crank Operation Safety Bottom Bar
Cremone Lock Safety Stop Bearing
CSI Safety Switch
Curtain Scissor Grille
Curved Slats Sectional Door
Cycle Security Chain Box
Cylinder Lock Sensing Edge
Dade County Approval Sensing Edge, Electric
Dead Tension Sensing Edge, Pneumatic
Disconnect Switch Sensor Edge
Door/Grille Combo Sensor Edge, Fail-Safe
Double Throw Lock Service Counter Fire Door
Drive Gear Service Door
Drive Plug Assembly Setback
Drive Shaft Shop Drawings
Drive Sprocket Shutter
Driven Sprocket Side Coiling Door/Grille
Dropout Sideroom
Drop Test Slat
Duranodic Slide Bolt
Dust Tight Slide Grille
"E" Guides Sloped Bottom Bar
Electrical Wireless Interlock Smoke Detector
Finish Coat Smoke Door (Shutter)
Fusible Link Smoke Gasketing
Galvanizing S-O Cable
Gauge (Gage) Soffit
Gear Cover Solenoid Brake
Governor Sparkproof
Grille Door Spot-Type Detector
Guide Assembly Spring Counterbalance: See Barrel Assembly.
Guide Standout Spring Cycle Life
Guide Weatherseal (1side) Square Hood
Guide Weatherseal (2 side) Stand-out
Gussets Starter, Electrical: See Contactor.
Hand of Operation Starter, Fire Door
Hazardous Location Starter Slats
Header Seal Stick-on Insulation
Headplates Stop Lock Bearing: See Inertia Brake.
Headroom Stops
Helical Tailgate Door
Hertz Take up Reel
High Cycle Design Tapered Bottom Bar: See Sloped Bottom Bar.
Hood TEFC
Hood Baffle Tension Wheel
Hood Bead TENV
Hood Support Thermal Overload
Hot Rolled Thermal Series
In Tube Motor Operator Thru-Shaft
Inertia Brake Thru-Wall Fusible Link
Initial Charge Thru-Wall Operation
Initial Tension Thumb Turn Mortise Cylinder
Initial Turns Timer to Close
Inset Tinted Anodizing
Inside Adjusting Wheel Top Hood Bead
Inside Tension Wheel Top Slats
Insulation Torsion Spring
Insulation Terms BTU Tubular Operator
Integral Frame and Shutter Turn Down Top Hood Bead
Integral Frame and Shutter, Labeled UL 325
Interlock, Emergency Hand Chain Underwriters' Laboratories (UL) (ULC)
Interlock, External Uniform Construction Index
Interlock, Wireless "U" Value
Intermediate Hood Support Vision Lite
Intrinsically Safe Vision Panel
Ionization Type Smoke Detector Viscous Speed Governor
Jamb Wall Angle
Jamb Angle Wall-Mounted Reversing Starter
Jamb Load Wicket Door: See Pass Door.
JIC Wind Bar
Keyed Lockout Windload
Key Switch Windlocks
"K" Value Working Turns
Labeled Shutter
 
Access Panel: An opening in a ceiling for access to tension adjusting wheel and to drive mechanism (motor, crank, chain hoist).  Furnished by the ceiling or General Contractor.
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Accordion Grille: A side sliding grille product that requires little headroom, and no floor track.  Grille is able to follow curved lease line and stacks into side pocket enclosure(s).
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Adjusting Wheel: See Tension Wheel.
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Air Infiltration: The passage of atmospheric conditions between two areas.
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Air Lock Set-up: Optional electrical device used between two doors-whereas either door must be fully closed before opposite door can open.  Sometimes used in high security areas.
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Air Switch: A diaphragm mounted to either the bottom bar or the wall, used with a pneumatic sensor edge to signal motor operator when the door has encountered an obstruction.
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AISC: American Institute of Steel Construction.
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All Weather Door: A coiling service door having all the weather-stripping features, consisting of guide weather-stripping, hood baffle and bottom astragal.
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Anodize: A hard, non-corrosive oxide film on the surface of aluminum doors, grilles or shutters created by electrolytic action.  The electrochemical process produces an anodic coating by conversion of aluminum to essentially aluminum oxide.  It is generally clear in color and yields a satin finish.
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Approved Equal: A phrase used on plans and specifications to indicate that a substitution can be made to a specified brand name or specified manufacturer. See Prior Approval.
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ASHRAE: American Society of Heating, Refrigeration and Air Conditioning Engineers.  Establishes standards for measuring effectiveness of insulating components.
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ASTM: American Society for Testing Material.  A source for establishing standards to which most door manufacturers adhere when designing and manufacturing a door component.
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Astragal: Neoprene or vinyl weatherstripping added to the bottom bar to seal opening along the floor or to protect a finished surface.
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Automatic Closing: Mechanical, self-closing device of a fire door upon melting of a fusible link, or activated by smoke detector or alarm system.
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B & S: Brown & Sharpe.  Gauge used for identifying aluminum thickness.  B & S gauges do not have the same decimal equivalents as standard steel gauges.
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Backroom: Amount of clear unobstructed space extending back from the face of the wall.
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Barrel Assembly: A steel tube or pipe that spans between the door brackets and contains the springs required to provide counterbalance and lifting capability.  The curtain coils up around the barrel.
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Barrel Ring: Stamping or casting, attached to counterbalance pipe or barrel, which is used to increase the curtain wrap diameter and which is attached to the curtain top slat.
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Bar Stops: See Wind Bar.
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Base Plate: Optional steel plate mounted under the tube support to help transmit weight of tube and product on floor.
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Bellmouth: Flared upper portion of guides to ease entry of curtain into the guides.
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Best Locks: Optional "brand name" locking system with removable locking cores.  Specify lock shells by Atlas Door™ with cores to be added in field by others.
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Between Jamb Mounted: Type of mounting where the guides are positioned between the mounting surfaces and not on the surface (interior or exterior) of the wall.  Guides are generally "packed out" mounted to the inside of jamb and hood below lintel.  Clear opening size will be reduced and may require "fascia" to close off back of hood.
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Bi-Part: A pair of vertical posts that divide an accordion grille into two or more pieces.  Used to stack grille into two pockets or to allow ease of operation on excessively large (>30'-0") grilles.
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Bonderizing: See Paint Bond.
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Bottom Bar: A reinforcing member at the bottom of a curtain; generally either two angles back-to-back forming an inverted "tee' or an extruded aluminum member.  Serves to add laateral strength to door, to add weight to help curtain close, to act as an obstacle to stop door when fully open, as a stop plate, and to hold weatherstripping.
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Bracket Plates: End supporting plates for the barrel counterbalancing assembly and to house coiled curtain.  One plate is the drive (chain hoist, crank or motor side) plate, the other is the tension (spring adjusting side) plate.  Each bracket plate is generally supported by the wall angle of the guide assembly.
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Brake, Dynamic: Optional braking system mounted between the motor and gear reducer used when rapid stopping of operator is required.
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Brake, Electrical: Solenoid activated friction brake is usually standard on most motor operators.
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Brush Seals: Term used to refer generically to the use of brush filament material either in use as a weather-seal or when used as smoke seals for smoke and fire doors.
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Brush Weatherstripping: Weatherstripping for use on all configurations of doors to close the gaps at jambs and header.  Brush material can be UL listed for fire door use.
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"C" Factor: Heat rate flow through an insulating material when there is a temperature difference from outer to inner surfaces.
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Cable Sensor Edge: An edge that uses two cables inside a standard neoprene loop astragal.  Upon connection with motor operator, a sensing field is established between the two cables.  Any disturbance to this field causes the motor to stop, or stop and reverse.
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Card Key: Optional electrical control device that reads a magnetic card to open/close product.  Should be specified and sequence desired, in coiling product specifications.  Usually supplied and installed by electrical contractor, but must be coordinated with coiling product for proper motor preparation.
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Center Hook Lock: A cylinder lock that locks a grille bottom bar directly to the floor.  Usually used in extreme widths for added security.
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Center Throw Lock: A center locking device available on Atlas Door grilles/shutters, unlocked by one cylinder that throws a locking bar into both guides, mounted on bottom bar.
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Chain Hoist: A mechanical device to assist in raising and lowering the door by use of hand chain and gear or sprocket reduction.
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Charge Pin: A metal pin used to lock tension wheel after proper spring tension is applied.
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Charge Wheel: See Tension Wheel.
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Class A, B, C, D: Underwriters Laboratories' designations to cover location of opening and appropriate UL Label to be furnished.  A - Fire Wall, 3 hour rating.  B - Elevator Shaft, 1-1/2 hour rating.  C - Partition, 3/4 hour rating.  D - Exterior opening.  Door and wall must be of equal rating.
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Clear-vue: Trade name for Atlas Door's LEXAN panels for coiling grilles and accordion (scissor) grilles.  Increases security without obstructing view into secured area.
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Coil-Cord: An extendable wire that attaches sensor device to the motor operator.  Maximum 20'-0" extended.
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Coiling Grille: An upward acting coiling gate offering security without loss of visibility or ventilation.  Widely used in shopping malls and parking areas.
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Combo Starter/Combination Reversing Starter: A wall-mounted reversing starter with one additional component; a disconnect switch or circuit breaker.  This switch is turned on and off by a handle mechanism attached to the door of the enclosure.  When the door is opened, the switch is turned off.  Either a disconnect switch or circuit breaker can be supplied.  In addition, if the choice is a disconnect switch, a further choice must be made; the switch may be either a fusible or non-fusible disconnect switch.  Job specifications will normally indicate which type of switch is to be supplied when a combination starter is required.  See Wall-Mounted Reversing Starter.
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Continuous Endlocks: See Endlocks.
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Continuous Windlocks: See Windlocks.
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Contractor: An electrical device that, by means of magnetic coils, performs switching and control of the door motor circuit.  Referred to as contactor, reversing contactor, magnetic reversing starter.  Includes thermal overload and includes mechanical interlock.
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Counter Shutter: A door used to close an opening which includes a counter-type sill.
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Counterbalance: A system of springs or weights to provide the amount of force needed to raise the door and maintain it in the open position.
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Crank Operation: A mechanical assisted operator using a wall mounted gear box on coiling doors and an awning box on grilles and shutters.
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Cremone Lock: Center locking device on doors/grilles that will throw a locking bar into both jambs. See Center Throw Lock.
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CSI: Construction Specification Institute.  See Uniform Construction Index.
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Curtain: The part of the door that actually rolls up and down, or slides side to side.  It may be manufactured of slats and/or rods and links, endlocks and windlocks.
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Curved Slats: The optional coiling/fire door curtain slat configuration.  Referred to as C-3 curved slat.
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Cycle: An action on the door from the fully closed position, to the fully open position, and returned to the fully closed position.
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Cylinder Lock: Key-operated locking device located on the bottom bar.
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Dade County Approval: Approval given to a coiling door manufacturer, on application and approved testing, by Dade County, Florida, to comply with its building code.  Normally requires heavier components to withstand unusually high windloads.
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Dead Tension: A spring tension method where tension is applied without the use of an adjusting wheel.  Limited by weight of curtain.  Not available on Thermal, Fire Doors or Labeled Shutters.
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Disconnect Switch: A mechanical device normally furnished and installed by electrical contactor.  Adjacent to the motor operator, it disconnects the main power source before it enters the door control box or battery back-up system, for safer servicing of electrical components.
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Door/Grille Combo: Combined assembly of a coiling service door and a coiling grille door sharing guides and common bracket plates.  Allows full security when required and ventilation with door opened and grille closed.
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Double Throw Lock: Center locking device that throws a locking bar into both guides, mounted on bottom bar.
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Drive Gear: Large gear for chain or crank-operated units.  It is directly fastened to the door shaft on the drive side bracket plate.
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Drive Plug Assembly: See Plug End.
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Drive Shaft: The shaft in the barrel that is securely attached to the barrel, through welding or pinning.  When this shaft rotates the barrel should also rotate.
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Drive Sprocket: The smaller sprocket on the motor operator that drives the Driven Sprocket on the coiling door sprocket.
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Driven Sprocket: The larger sprocket on the door product that is driven by the Drive Sprocket on the motor operator.
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Dropout: Weighted mechanical device for disengaging gearing motor operator for coiling fire doors.  Also used to activate closing spring and to release governor in case of fire.
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Drop Test: Test performed on a fire door to ensure proper operation during emergency.  Testing is required to be performed annually see NFPA 80.
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Duranodic: Alcoa trade name for an electrochemical treatment on aluminum that results in development of color while protecting against oxidizing.  Colors and shades are limited since process results are a function of alloy used.  Bronze finish colors and shades are identified by number, 311, 312, 313, etc.
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Dust Tight: Electrical designation and special requirement available for various components.  See NEMA.
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"E" Guides: Common expression for the shape that guides form when they are mounted to steel jamb supports or frames.
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Electrical Wireless Interlock: An interlock integrally contained within an Atlas Door motor operator.  This interlock will sense when a bottom bar lock is engaged and prevent the motor operator from causing damage to the bottom bar, locking device, or the motor operator itself when electrical operation is attempted prior to the lock being disengaged.  This option requires no additional field wiring by the Electrical Contractor.
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Finish Coat: Prime coat of paint applied to galvanized steel before roll forming.  Paint is baked-on.  Used on slats, hoods, fascias and soffits when specified.
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Fusible Link: Two metallic pieces that are joined together by a low temperature alloy.  When the ambient temperature exceeds that of the alloy, the connection melts and the pieces separate.  These are used to release holding chains or cables that maintain a mechanical fire door release system.  The most common temperature for a fire door is 165° E.
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Galvanizing: Zinc coating to protect steel against corrosion.  Slats and hoods made of steel are galvanized.  Optional on other steel surfaces.
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Gauge (Gage): U.S. Standard gauge, specifies that weight per square foot would be indicated by gauge numbers, i.e. 20 gauge.  Galvanized sheet, weighs approximately 1.65 lbs. (7.3 KG/Sq. mē) per sq. ft. and is approximately 0.036" (0.912 mm) thick.  Based on 40.8 lbs. per square foot, 1" thick steel. 
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Gear Cover: Metal cover protecting the drive mechanism from weather and debris.
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Governor: Device on coiling fire door drive brackets to control rate of descent of rolling fire door when released in the event of fire.
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Grille Door: An upward acting coiling gate offering security without loss of visibility or ventilation.  Widely used in shopping malls and parking areas.
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Guide Assembly: Consists of two or more angles or a roll-formed channel to create a groove in which the coiling curtain moves up and down.
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Guide Standout: The distance that face-mounted guide assembly extends from wall face.
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Guide Weatherseal (1side): A strip of weatherstripping material that is attached to the exterior guide angle and designed to compress against the exterior surface of the curtain slats.  The material may be vinyl, neoprene, rubber, or brush filaments.
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Guide Weatherseal (2 side): The weather stripping material is applied on both the exterior and interior guide angles and is designed to compress against both the interior and exterior curtain surfaces.
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Gussets: See Bracket Plates.
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Hand of Operation: The side on which the door operation mechanism is placed, as viewed from the coil side of the door.  It is either a RH or LH operation.
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Hazardous Location: Building areas where explosive or volatile conditions exist such as paint spray areas, and grain elevators, etc.  Electrical equipment in such areas must often be explosion proof.  See NEMA.
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Header Seal: Weatherstripping mounted to opening header to seal the opening between header and curtain, sometimes used where hood baffle is ineffective.
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Headplates: See Bracket Plates.
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Headroom: Amount of clear unobstructed space about the door lintel or header.
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Helical: It means a spiral, and is a term referring to the type of torsion spring used in the spring counterbalance.
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Hertz: Cycles per second (Hz).
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High Cycle Design: Door components and operator designed for a fixed number of cycles for a specific period of time.
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Hood: Metal cover that conceals the door/grille coil and is attached and supported by headplates and intermediate hood supports (if required).
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Hood Baffle: A flap of material secured to the interior of the door hood, resting on the curtain roll and designed to retard air infiltration over and through the hood.
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Hood Bead: Stiffening bead (or bend) added to hood to prevent sag.  Top hood bead is reversible.  See Turn Down.
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Hood Support: A structural member which is rigidly contoured to the shape of the hood.  It is attached to the hood to add rigidity to the hood and its upper end is attached to the building.  Generally furnished on doors 16'-0" (4879 mm) and wider and on two-piece spliced hoods.
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Hot Rolled: Forming of structural steel shapes, usually angles, I-beams, channels, through a succession of rollers.
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In Tube Motor Operator: Totally concealed motor operator that mounts inside counterbalancing shaft.  Reduces clearance requirements, but limits size optional electrical features.  Normally used on shutters, grilles and small coiling doors.
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Inertia Brake: A unit that is attached to the door shaft and headplate ore wall, which will stop the door from free falling should there be a failure in the motor operator brake, roller chain drive or torsion spring assembly.  When the shaft is moving at a certain RPM the unit will lock up the shaft, preventing it from moving until door can be repaired. 
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Initial Charge: See Initial Turns.
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Initial Tension: See Initial Turns.
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Initial Turns: Amount of turns of the tension shaft to apply spring tension from zero with the door in the fully open position.  These turns provide the minimum moment or force to hold door in the open position.
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Inset: See Setback.
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Inside Adjusting Wheel: See Inside Tension Wheel.
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Inside Tension Wheel: Spring adjusting wheel located inside bracket plate so that no additional sideroom is required beyond the guide.
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Insulation: Material having the ability to reduce heat or cold transmission.  Two popular types are: foam injected polyurethane and rigid block polystyrene.
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Insulation Terms BTU: Amount of heat necessary to raise the temperature of one pound of water one degree F.
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Integral Frame and Shutter: Combination unit of coiling shutter built into a frame that often includes a sill.  Built into wall construction by General Contractor.  Can be furnished as a split frame unit so it can be erected in an existing opening.  See Integral Frame and Shutter, Labeled.
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Integral Frame and Shutter, Labeled: Same general construction as Integral Frame and Shutter except door will drop on temperature rise or smoke detection (if specified).  Limited in width to 6'-0" (1829 mm) and height to 4'-0" (1219 mm).  No split-frame construction permitted; shutter must be built into wall construction by General Contractor.
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Interlock, Emergency Hand Chain: Motor operator component switch which will prevent electrical operation if emergency hand chain or crank operator is engaged.
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Interlock, External: An electrical switch to prevent motor operation if locking device is not first disengaged.  Not to be confused with interlock of emergency hand chain operator. 
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Interlock, Wireless: Optional feature integral of the Atlas Door motor operator, to prevent motor operation if emergency hand chain or crank operator is engaged.
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Intermediate Hood Support: A rigid member which is contoured to the shape of the hood and mounted to the wall, between the headplates.  The hood is then attached to the support to give the hood rigidity.
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Intrinsically Safe: Refers to electrical equipment that, by its construction, should not permit sparking precipitating an explosion in hazardous areas.  Permits use of standard Safety Edge and Reelite in explosion-prone environment.  See Explosion Proof and NEMA.
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Ionization Type Smoke Detector: Particular or smoke in the air is sensed signaling the magnetic release permitting the door to close.  See Magnetic Release and Fire ScoutŪ.
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Jamb: A vertical member at either side of a door or window frame.
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Jamb Angle: An angle of the guide assembly in which it attaches to the inside of jambs and supports the load of the door assembly.
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Jamb Load: Force exerted on jamb by guide assembly when curtain is subjected to windload.
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JIC: Joint Industrial Conference.  Industrial group that has established standards and special requirements.  In our case, JIC requirement affects motor operator.  Special requirements and pricing.
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Keyed Lockout: Optional electrical control device of 3 buttons (open-close-stop) and a keyed 2 position cut-out switch (on-off).
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Key Switch: Optional electrical control device, key operated to open, close and stop.
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"K" Value: (Thermal Conductivity) - laboratory determined value of thermal conductance of a material.
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Labeled Shutter: A miniature fire door approved by UL (ULC) primarily used on smaller openings.
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Label Size: The largest size of a fire door or fire shutter assemble, fire-proven by test, to meet a specific fire rating.
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Lift Handle: A handle supplied on manual push-up doors, to assist in raising and lowering the door.
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Limit Switch: Device to limit opening and closing travel of motorized door and eliminate over-travel.  Roller chain driven, arranged so that emergency hand chain or manual operation will not affect limit switch setting.
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Locking: See Slide Bolts or Cylinder Locks.
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Locking Pawl (Pin): A metal piece used to lock spring adjusting wheel as tension is applied.
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Loop Detector: Device generally buried in the ground that will activate the motor operator to open or close by sensing mass or pressure.  Usually supplied and installed by Electrical Contractor, but must be coordinated with coiling product for proper motor preparation.
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Magnetic Release: Device connected to a smoke detector or alarm system, that on either an interruption of electrical power or applied signal will release the automatic closing device of a fire door or fire shutter.
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Magnetic Reversing Starter: See Contractor.
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Malleable Iron: Casting alloy used for endlocks and other components subject to shock or requiring good abrasion resistance.
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Manual Override: Means of operating a motorized shutter by manual operation in case of power loss.
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Master Keying: Arrangement whereby cylinder locks, although fitted with different keyed cylinders, can be opened or locked by means of one "master" key.
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Metric System: A standard system of weights and measures having the Meter as unit of length, the Liter as measure of volume, and the Gram as unit of weight.
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Midget Slat: The term used for the smaller slat used on the shutter product line.  Midget slats are available in aluminum, steel, stainless steel, and wood materials.
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Mill Finish: Finish as received from manufacturer; applies generally to aluminum and stainless steel.  Will show extrusion die marks in aluminum.  Stainless steel in mill finish is referred to as 2B.
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Motor By Others: Option to apply motor from source other than door manufacturer.  Not recommended since mounting, shaft size, key size and horsepower requirements are properly determined by door manufacturer.
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Motor Cover: Metal cover to protect the motor from exterior weather; debris, or to meet OSHA safety requirements.
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Mullion, Motorized: A combined guide assembly joining two adjacent rolling doors where center guide is hinged and motorized to lift up and out of the way; to expose a full opening width when both doors are open.
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Mullion, Removable: A combined guide assembly joining two adjacent rolling doors where center guide is hinged and motorized to lift up and out of the way, to expose a full opening width when both doors are open.
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NBFU: National Board of Fire Underwriters.  An independent group sponsored by an association of insurance companies.
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NEMA: National Electrical Manufacturers Association.  Established to provide standards for electrical components.  Number designation refers to motor operator and controls to meet the required ambient requirements:

     NEMA 1 - General Purpose
     NEMA 4 - Watertight
     NEMA 7 - Explosion Proof-Class 1 
     NEMA 9
- Explosion Proof-Class 2
     NEMA 12 - Dust and Oil Tight
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NFPA: National Fire Prevention Association.  Establishes standards for fire door installation.  NFPA Bulletin 80 is usually referred to in specifications.
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NFPA 72, National Fire Alarm Code: Code deals with the application, installation, performance, and maintenance of fire alarm systems and their components.
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NFPA 80, Standard for Fire Door and Fire Windows: Regulates the installation and maintenance of assemblies and devices used to protect openings in walls, floors, and ceilings against the spread of fire and smoke within, into or out of buildings.
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Offset: Dimension between face of header of jamb and center line of curtain.  Required to reduce drag of curtain on bellmouth of guides when curtain is in a lowered position.
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Offset Bottom Bar: Optional configuration so bottom bar will align with step offset in floor.
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Oil Tight: Electrical designation. Available for various components.  See NEMA.
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Oscillation Governor: A cast iron or steel cut combination of tooth gear and governor ring.  Governor ring is off-balanced to cause the ring to ratchet with the tooth gear to control the rate of decent of a fire door or labeled shutter during its emergency mode operation.
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Oversized Label: A fire door on fire shutter assembly that has not been fire tested, and receives a label or a Certificate of Inspection which does not indicate that the door is capable of furnishing "Standard Fire Protection", but only that the door conforms to the construction requirements.
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Packout: Guide build-out to clear obstruction or provide clearance for drive or tension mechanism when door is between-jamb mounted.
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Paint Bond: Treatment applied to galvanized steel to insure paint adherence.  Generally consists of phosphoric acid bath and water bath.  Also know as Bonderizing.
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Panic Release Device: See Emergency Release Device.
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Pass Door: Hollow-metal pedestrian door integrated into the rolling door, the frame of which is hinged at the jamb so door frame swings out of the opening.
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Patterns, Grille: Straight and Brick curtain patterns.  Consult factory for narrower link patterns.
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Pendant Switch: Optional electrical control device hung from the ceiling.  Generally used at interior openings for operating doors by approaching vehicles.  Can be single or double acting pull cords.  Single acting when single pull opens or closes door (reversing position of door); double acting when one cord opens, second cord closes.  Sometimes referred to as a pull cord switch.
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Perforated Slats: See Fenestrated Slats.
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Photoelectric Type Smoke Detector: Particulate or smoke in the air is sensed by the interruption of a light beam signaling the magnetic release to permit the door to close.  See Magnetic Release and Fire Scout.
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Pipe Shaft: See Barrel Assembly.
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Plug End: Drive end of barrel assembly driven by gear or sprocket for which the curtain is raised and lowered.  Consists of assembly of short solid shaft and one or more round plates welded to the shaft and pipe which fit within the pipe.
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Pneumatic Sensor Edge: Uses an air hose with a diaphragm mounted to the wall or bottom bar, air hose is put into loop astragal.  Upon contact with obstruction, air hose is put into loop astragal.  Upon contact with obstruction, air hose will pulse diaphragm to signal motor operator to stop or stop and reverse the downwar motion of the door/grille.
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Polycarbonate: Thermoplastic used in sheet form.  Impact strength and heat resistant.  For vision panels and grille inserts.  See Clear-vue.
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Powder Coating: A paint process that allows powder to be applied to a surface in its dry form.  Upon exposure to elevated heat the components chemically cross link within themselves to form a better adhesive finish, with a more consistent color that is available in a variety of glosses, texture and colors.  Atlas Door will consider custom color requests when a manufacturer's name and color number are provided.
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Pre-Turns: See Initial Turns.
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Prior Approval: A requirement that approval in writing or addendum be issued by the architect, before bid date to allow a substitution on a specified brand name or manufacturer.  See Approved Equal.
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Pull Cord: See Pendant Switch.
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Push Button Station: Standard electrical control device of 2 or 3 buttons (Open & Close or Open, Close & Stop).
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Quartzoid: Trade name for liquid-filled fusible device, used generally on larger sized motor operated coiling fire doors.
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"R" Value: Thermal Resistance - ability of a material to retard the transmission of heat.  Note: the higher the "R" value, the better the insulting performance; the lower the "U" value, the better the insulation material.
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Reelite: See Take up Reel.
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Reversing Contactor: See Contactor.
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Safety Bottom Bar: See Sensor Edge.
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Safety Stop Bearing: See Inertia Brake.
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Safety Switch: See Disconnect Switch.
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Scissor Grille: See Accordion Grille.
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Sectional Door: Upward-acting articulating overhead door.
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Security Chain Box: Metal enclosure that encloses hand chain in a steel pad-lockable assembly attached to door guide.
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Sensing Edge: A device mounted on the bottom bar of an electrically-operated door to stop or stop-and-reverse the closing door upon contact with an obstruction in the door opening.
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Sensing Edge, Electric: An electrical bottom bar astragal enclosed with two parallel foils.  When closing door bottom bar touches an obstruction, the foils close an electric circuit to cause the operator to stop or stop-and-reverse the door.
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Sensing Edge, Pneumatic: An air hose installed inside the bottom bar astragal and connected to a diaphragm switch, to signal the motor operator to stop or stop-and-reverse the door.
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Sensor Edge: Electrical or pneumatic device mounted on the bottom bar of the door to stop or stop-and-reverse the door when closing by the motor operator should the door meet an obstruction.
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Sensor Edge, Fail-Safe: is the same as electrical except, should the safety edge become damaged, the door will reverse to the fully open position and will remain open until the safety edge is repaired.
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Service Counter Fire Door: A small version of a fire door where the combined door, sill, and frame (optional) assembly has a fire protection rating and will automatically close to a counter top in case of fire.
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Service Door: A heavy-duty upward acting coiling door.  Very versatile in its operations and applications.
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Setback: A standard space where the guide is recessed from edge of the jamb at both sides of opening on a face of wall-mounted door.
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Shop Drawings: Prepared for the Architect and General Contractor by the door manufacturer to show clearances and general construction details to assure proper interpretation of the specifications.  Approval usually precedes fabrication.
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Shutter: Small slat coiling unit generally used at counter openings.
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Side Coiling Door/Grille: Move horizontally in locations with limited head room.  Available in grille, flat slat or wood slat configuration.
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Sideroom: Required unobstructed space on either side of the opening.
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Slat: Cold roll-formed or extruded member of which curtain is formed.  Slats are formed so as to interlock and form a water-shedding surface.
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Slide Bolt: Locking device on bottom bar which slides into guide or guide shoe and is equipped for padlocking.  Mounted either inside, outside or both sides of the door.
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Slide Grille: A side-sliding grille product that requires little headroom and no floor track.  The grille, is able to follow a curved lease line and stacks into a side pocket in the wall.
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Sloped Bottom Bar: Tapered bottom bar to match sloped sill of opening.  Accomplished by inserting a tapered plate between bottom bar angles.  This tapered plate will hang into opening on low side unless door height is increased and coil raised to have sloped bar clear opening when door is open.
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Smoke Detector: A device that senses visible or invisible particles of combustion and/or heat.
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Smoke Door (Shutter): Designed to limit smoke spread in elevator lobbies, corridors, etc.  Equipped with perimeter smoke seals.  Shutter closes on signal from smoke detector or temperature rise.  Can be furnished with a glass lite at eye level.  Warnock Hersey International approved.
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Smoke Gasketing: Brushseal used on fire doors or fire shutters to reduce the passage of smoke and gases.
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S-O Cable: Oil resistant flexible electrical cable in take-up reel which is sometimes specified for sensor edges.
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Soffit: Steel or aluminum shape to close underside or exposed face of ceiling when shaft is mounted above ceiling.  Not available with a hood.  See Access Panel.
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Solenoid Brake: Electrically activated mechanical switching device whereby an electric current flows through an electromagnet having a movable core.  Movement of the core activates the motor operator brake: power On, brake Off - power Off, brake On.  See Brake, Electrical.
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Sparkproof: Specified item when volatile or gaseous conditions exist.  Very special construction required to prevent sparking caused by metal-to-metal contact.  Special hand chain, gears and other items required.
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Spot-Type Detector: A device with a detecting element concentrated at a particular location. Typical examples are bimetallic detectors, fusible allow detectors, certain pneumatic rate of rise detectors, certain smoke detectors, and thermoelectric detectors.
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Spring Counterbalance: See Barrel Assembly.
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Spring Cycle Life: Spring counterbalance is designed for a fixed number of cycles.
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Square Hood: Alternate shape available on doors in place of standard round.  Standard on all shutters.
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Stand-out: The distance that guide assembly extends out from the wall on face-of-wall mounted doors.
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Starter, Electrical: See Contactor.
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Starter, Fire Door: A mechanical device to imitate the closing of door in the event of a fire, independently of the hand chain, crank or motor operator normally used to close door.
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Starter Slats: Partial slats used to connect curtain to barrel rings.
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Stick-on Insulation: Optional foam insulating material added to inside face of curtain slat.  Not widely used since the introduction of Thermal Doors.
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Stop Lock Bearing: See Inertia Brake.
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Stops: Bars mounted at top of guides to prevent bottom bar from traveling out of the guides when the curtain is fully raised.
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Tailgate Door: A door located above an aircraft hangar door that picks up a section of the main hangar door upper track effectively increasing the opening height in that area.
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Take up Reel: Mounted near the motor operator and is a self-coiling electrical cord to supply the electrical signal from the circuit of the sensor edge to the motor operator.
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Tapered Bottom Bar: See Sloped Bottom Bar.
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TEFC: Totally enclosed, fan cooled motor operator specification that allows on ventilation on motor housing, but incorporates a fan to carry most of the heat off.
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Tension Wheel: Casting, either pinned or keyed to the spring inner shaft, with which the counterbalancing springs are initially tensioned or adjusted, and is used in conjunction with a locking pawl or pin to lock adjustment.
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TENV: Totally enclosed, non-ventilated motor operator specification that allows on mechanical ventilation on motor housing.
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Thermal Overload: May be referred to as Heat and Current Sensing Device.  An electrical device normally located in the motor that, upon sensing of an abnormal current flow, will cause a set of contacts to open, stopping the current.  It must be specified when required.
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Thermal Series: Trade name for Atlas Door's insulated coiling door.
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Thru-Shaft: Option on a manual operated service door, coiling grille, counter shutter, small fire door or small labeled shutter that cuts the drive shaft flush with drive bracket plate.  No additional sideroom is required beyond guide depth and bracket plate thickness.  Cannot add chain, crank or motor in future without major replacement of materials.
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Thru-Wall Fusible Link: Extending a fuse linkage to the opposite side of an opening, with respect to the side the door is mounted on.  Required per NFPA 80 for all non-exterior mounted doors.
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Thru-Wall Operation: A door driven by means of a hand chain, crank or motor operator located on the opposite side of the wall.
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Thumb Turn Mortise Cylinder: Locking device, much like a cylinder lock but does not require a key to lock or unlock.
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Timer to Close: Furnished to automatically close a motor operated door at predetermined interval after opening.  Requires the use of a sensor edge to prevent damage or injury due to unsupervised operation.
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Tinted Anodizing: An effective and attractive coloring and anodizing process for aluminum that is not subject to sunlight.  Many colors available, but custom colors will result in extended lead time for fabrication.
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Top Hood Bead: Bottom bead cannot be reversed.
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Top Slats: Roll-formed curtain materials used inside coil box above door or grille curtain.  Attaches to starter slat.
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Torsion Spring: A helical wound spring, commonly mounted inside a steel pipe, used to counterbalance curtain.
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Tubular Operator: A cylindrical operator that mounts directly into the pipe and electrically drives the barrel assembly.
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Turn Down Top Hood Bead: Optional reversal of top stiffening bead to reduce head clearance.
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UL 325: Underwriters' Laboratories regulation promulgated in 1973 mandating safety edges on motor operators door or constant pressure push buttons.  UL 325 is updated and revised on a continuing basis and therefore must be consulted for current codes and regulations.
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Underwriters' Laboratories (UL) (ULC): Independent testing laboratory to evaluate products, construction, systems with respect to possible hazards.  Approval is indicated by the label on fire doors, shutters, motor operators and other electrical devices.  They maintain inspection services of manufacturer's products during fabrication to be certain of compliance with original approved design or procedure.
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Uniform Construction Index: CSI Format system to standardize classification of construction related products; Section 08330 - Coiling Doors & Grilles (Coiling Steel, Fire, Grilles, Shutters), Section 08360 - Upward Acting Sectional Doors.
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"U" Value: Heat Transmission Coefficient - amount of heat, in BTUs, transmitted through one square foot of material (the door) in one hour at a temperature difference of 1° from one side to the door.
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Vision Lite: A series of single cut-outs in a door, glazed with clear plastic.
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Vision Panel: A series of cut-outs or lites glazed with clear plastic.  Configuration will vary depending on manufacturer.  Atlas Door's standard is 5" (127 mm) wide x 3/4" (19.05 mm) high cut-out, in sets of 15 cut-outs, five slats high, three cut-outs wide.
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Viscous Speed Governor: Device to control the drop rate on fire doors.
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Wall Angle: An angle of the guide assembly which attaches to the face of wall and supports the load of the door assembly.
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Wall-Mounted Reversing Starter
: All control components that are normally enclosed in the operator mounted control box are supplied in a separate wall-mounted enclosure.  These components include the reversing contactor, overload relay, control relays, and control transformer.  Only the limit switches remain in the operator mounted control box.  This necessitates additional field wiring between the operator and the wall-mounted starter.  In addition, all other control devices (push buttons, safety edge, etc.) are wired to the wall-mounted starter instead of to the operator.  See Combo Starter.
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Wicket Door: See Pass Door.
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Wind Bar: Channel or bar welded inside guide groove which engage windlocks under windload.
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Windload: The design criteria that most coiling manufacturers adhere to is 20 lbs. per sq. ft. (0.96 kPa) or 87 mph (140 KPH).  Greater windloading capacity is available.
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Windlocks: Malleable iron casting riveted at predetermined intervals to slat ends to prevent curtain from leaving guides under windload, and which are used in conjunction with channels or wind bars in guides which windlocks engage under windload.
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Working Turns: The additional winding of the springs as the barrel rotates and the curtain closes.
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