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Industry Terms


Access Panel: An opening in a ceiling or soffit for access to tension adjusting wheel and to operator drive mechanisms (motor, crank, chain hoist). To be furnished by the ceiling subcontractor or general contractor and not by the door manufacturer.

Accordion Grille: An accordion grille product that requires little headroom and no floor track. The grille is able to follow a curved line and stacks into a side pocket(s) in the wall. Also called side-sliding grilles, accordion grilles or Cornell VisionGlide.

Adjusting 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.

Adjustor: Refers to the device for spring torque adjustment. May be located inside or outside the bracket or within the barrel assembly.

Air Switch: A diaphragm device mounted to either the bottom bar or the wall, used with a pneumatic sensing edge to signal a motor operator when the door has encountered an obstruction.

Anodize; Anodized: 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.

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.

ASHRAE: American Society of Heating, Refrigeration and Air Conditioning Engineers. Establishes standards for measuring the effectiveness of insulating components.

Assembly: A composite of more than one part as produced in the factory.

ASTM: American Society for Testing Material. A source for establishing standards to which most door manufacturers adhere to when designing and manufacturing door components.

ASTM C423: Standard test method for sound absorption and sound absorption coefficients by the reverberation room method.

ASTM E84: Surface burning characteristics of building materials.

ASTM E90: Laboratory measurement of airborne-sound transmission loss of building partitions.

ASTM E336: Standard test method for measurement of airborne sound insulation in buildings.

ASTM E413: Determination of Sound Transmission Class rating, STC.

ASTM E557: Architectural application and installation of operable partitions.

Astragal: A synthetic material weathering strip attached to underside of bottom bar.

Authority Having Jurisdiction (AHJ): The organization, office, or individual responsible for approving equipment, an installation, or procedure.

Automatic Closing: Mechanical, self-closing of a fire door.

Automatic Closing Device: An integral release system of a fire door or operator that when activated by a signaling device such as a fusible link, an alarm system or power failure, causes the door to close.


Backroom: Amount of clear unobstructed space that is required extending back from the face of the wall.

Barrel Assembly: A steel tube or pipe that spans between the door brackets and contains the springs required to counterbalance the curtain weight. The curtain coils up around the barrel.

Barrel Ring: Metal stamping or casting attached to counterbalance pipe or barrel. Are used to increase the curtain wrap diameter for better counterbalance and smoother operation.

Base Plate: Optional steel plate mounted on the floor to distribute weight from a framing system supporting the door.

Bellmouth: Flared upper portion of guides to direct the entry of the curtain into the guide groove.

Best Locks: Optional "brand name" locking system with removable locking cores.

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.

Bi-parting Doors:
Two operable wall panels, each with a fixed end, meeting and latching within the opening.

Bi-Parting Members: A pair of vertical posts that divide a side folding grille into two or more pieces. Used to stack grille into two pockets or to allow ease of operation on large grilles.

Bi-parting Post: Mates and secures to a lead post and acts as a lead post for part of the operable wall panel. Accepts a hook bolt assembly from the lead post.

BOCA: Building Officials and Code Administrators (Code Group).

Bonderizing: Treatment applied to galvanized steel to insure paint adherence. Generally consists of phosphoric acid and water bath.

Bottom Bar: A horizontal 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 lateral strength to door, to add weight to help curtain close, to act as an obstacle to stop door when fully open and to hold weather-stripping.

Box Guide (or "E" Guide): A face of wall mounted guide with the wall angle turned towards the opening. Normally used when mounting to a steel framed opening.

Bracket Assembly: A steel plate with bearings or operator components. Mounted at top of the guides for supporting the ends of the barrel, and closing the ends of the coil space.

Bracket Packoff: Dimension from fascia edge of bracket to centerline of guide gap.

Bracket Plates: End supporting plates for the barrel counterbalancing assembly. 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.

Brush Seals: Term used to refer to the use of brush filament material either as a weather-seal or when used as smoke seals for smoke and fire doors.

Brush Weather-stripping: Weather-stripping 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.


CCC-W-408A-D: Federal specifications that applies to vinyl coated wall coverings.

CFFA-W-101-B: Chemical Fabrics and Film Association quality standard for vinyl coated wall coverings.

Ceiling Guard: Decorative extrusion that mounts to header against the track.

Chain Hoist: A mechanical device to assist in raising and lowering the door curtain by use of a hand chain.

Charge Pin: A metal pin used to lock the tension wheel after proper spring tension is applied.

Charge 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. Also known as Tension Wheel.

C.I.W.: Abbreviation for Cornell Iron Works, Inc.

Coil: Term referring to the curtain as it is rolled around the barrel.

Coil Side: The side of the rolling closure (door, grille, or counter door) on which the shaft assembly is located with the curtain rotating up towards the observer when opening. Note: All right or left-hand references are made from coil side regardless or door location. See interior and exterior.

Coiling: Door and Grille products that roll upward and store in a tight coil above the opening. See below.

Coiling Door: Roll upward and store in a tight coil above the opening. See Service Door. Also called Coiling Service Door, Commercial Door, Rolling Door, Overhead Door.

Coiling Fire Door: Roll upward and store in a tight coil above the opening. See Fire Door. Also called Rolling Fire Door, Overhead Fire Door.

Coiling Grille: Roll upward and store in a tight coil above the opening. See Rolling Grille.

Coiling Shutter: Roll upward and store in a tight coil above the opening. See Counter Door. Also called Counter Shutter, Shutter.

Commercial Door: See Service Door. Also called Coiling Door, Rolling Door, Overhead Door.

Cornell™ , Cornell Iron Works® : Trademarked company name. Also CIW.

Counterbalance: A system of springs that provides tension to aid door operation and to maintain it in the open position.

Counter Door: A smaller metal slatted door assembly generally used to close off counter window wall openings. Also called Shutters.

Counter Fire Door: A door that has a fire protection rating and will close to the floor or counter top automatically in case of fire. Also called Fire Shutter.

Counter Shutter: Roll upward and store in a tight coil above the opening. See Service Door. Also called Coiling Service Door, Commercial Door, Rolling Door, Overhead Door.

Crank Operation: A mechanical operator using a bracket or wall mounted gear box and a hand crank.

CrossingGard®: Registered Cornell product Model ERG10, ERG-IBC. Provides the security of a locked rolling grille but when alarm is activated, power is lost, or if the IBC emergency exit push-button station is activated, clears the path by returning the grille to the full open position without requiring an electric or battery power source. Includes AutoLock. Model ERG-IBC is ICC-ES evaluate for access controlled egress per the 2003 International Building Code.

Crush Plates: Bearing plates provided where doors are mounted on concrete masonry wall units with hollow cells to accommodate through-wall bolts to prevent crushing of the hollow concrete masonry units.

Curtain: The part of the door that actually rolls up and down. It may be manufactured of slats and/or rods and links.

Cycle: An action on the door from the fully closed position, to the fully open position, and returned to the fully closed position.

Cylinder lock: Key-operated locking device generally located on the bottom bar.


Dade County Approval: Approval given to a coiling door manufacturer, upon application and approved testing, by Dade County, Florida, to comply with its building code. Normally requires heavier components to withstand unusually high wind loads.

Design Wind Load: The Design Wind Load is expressed in pounds per square foot (psf). This is the load used in structural design of the door system. The value of the Design Wind Load is determined for each specific application in accordance with the applicable building code. In the case of the Florida Building Code, the determination is made using the procedure described by ASCE 7-98. The value applicable to a specific installation is determined based on the Design Wind Speed, the Mean Roof Height of the building, the location on the building of the door and several other factors including terrain and building type. The building designer should include the value for the Design Load in the specification for the door system, not the wind speed. Care must be exercised in reviewing some specifications since confusion exists in the distinction between Design Load and Test Load.

Disconnect Switch: A mechanical device normally furnished and installed by the electrical contractor. Mounted 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.

Distance Between Brackets (D.B.B.): Horizontal distance between the inside of the bracket plates.

Distance Between Guides (D.B.G.): Least horizontal distance between guide member projections.

Door Operator: The actual mechanism that provides motion, such as chain operator or motor operator.

Double Throw Lock: Center locking device that throws a locking bar into both guides. Generally mounted on the bottom bar.

Driven Sprocket: The larger sprocket on the door product shaft that is driven by the Drive Sprocket on the operator.

Drive Shaft: The shaft in the barrel that is securely attached to the barrel, through welding and/or bolting. When this shaft rotates the barrel will rotate.

Drive Sprocket: The smaller sprocket on the motor operator that drives the Driven Sprocket on the coiling door product.

Dropout: Weighted mechanical device used to initiate spring tension release. Also used for disengaging operator gearing or motor operator for rolling fire doors.

Drop Test: Test performed on a fire door to ensure proper operation during emergency. Testing is required to be performed at least annually (see NFPA 80).

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.


"E" Guide: A face of wall mounted guide with the wall angle turned towards the opening. Normally used when mounting to a steel framed opening.

Electric Sensing Edge: A device mounted on the underside of 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. More at Sensing Edge.

Electromechanical Release: A device which holds a fire door automatic closing device until it receives a signal from a fire alarm or detection system and releases. If power fails the device also releases. There are a variety of models and features. Most have a time delay before release to prevent nuisance releases.

Emergency Release Device or (Mechanism): A wall mounted release handle used with an electric operator to permit emergency egress (exit). Normally furnished on grilles in Malls/Shopping Centers where building codes dictate. Device allows mechanical opening of the curtain without electrical power. Use of this device is restricted by curtain weight and other factors. Thumb turn cylinder locking required.

Endlocks: Molded nylon, steel stamping or malleable iron castings which are riveted to curtain slat ends at every other slat to prevent slats from shifting laterally, and to acts as wear surface in guide bell mouth.

Endlock / Windlock: Castings fastened to the ends of a slat that serve as endlocks, but also provide a means of retaining the curtain in the guides under wind load conditions.

End Member: The vertical edge post of a side folding grille or side folding closure.

End Plates: End supporting plates for the barrel counterbalancing assembly. 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.

Exterior Hood: Hood construction with a flat flange at the top of hood to accept field caulking. Sloped or pitched hood is commonly used.

Exterior Mounted: Condition where door (coil housing) is mounted on exterior surface exposed to weather and wind load. Usually requires "exterior hood" and "gear covers".

EZ Test 'n Set™: Trademarked Cornell fire door closing system: a slow closing system for chain operated fire doors that can be tested and reset from the floor with a test handle.


Face of Wall: Door mounting condition where guides surface mount to the interior or exterior side of the wall, and additional side clearance is allowed for tension wheel and drive mechanism. Full clearance of opening is maintained.

Fail Safe: Term used to describe how a product must perform when power fails.

Fascia: Metal closure for back of door housing. Required when there is only a partial or no header in place and back of door coil is exposed. Required when the wall above header is not full thickness of jamb (prefab building). Normally required for between jambs mounted units.

Fascia Side: A term used to reference the side of the door opening opposite the side that the door coil is located.

Fastening Sections: Short sections of slat on the top of the curtain assembly used for attaching the curtain to the rings or pipe.

Fenestrated Slats: Rolling Door or Counter Door slats with multiple small window size punched slots that create an open curtain design. Allows security along with ventilation and visibility. Also see perforated slats.

Fire Door: A door that has a fire protection rating and will close to the floor or sill automatically in case of fire. Also called Coiling Fire Door, Rolling Fire Door, Overhead Fire Door.

Fire Door Operator: Could refer to any of a range of closing alternatives for fire door products. Conventional fire door automatic closing systems release spring tension and require mechanical resetting by a trained door technician, to Cornell M100 Closing Systems that address today's issues of annual door testing requirements, more frequent alarm testing, recessed installation and power outages.

FireGard: Cornell tradename that refers to Cornell fire products.

Fire Rated Doors: Fire door product with UL or FM label for fire protection.

Fire Shutter: A door that has a fire protection rating and will close to the floor or counter top automatically in case of fire. Also called Counter Fire Doors.

Fixed Panel: A non-operating rigid assembly consisting of framing members around a section of rolling grille or door curtain specially fabricated to fit the size and shape of a particular opening.

Flame Baffle: Hinged metal shield released by a fusible link inside a fire door hood that closes the space between the top of the curtain and the hood.

Flat Slat: Cold roll-formed or extruded members that form the curtain. Slats are formed so as to interlock and form a water-shedding surface.

FM: Factory Mutual (Research) - a not-for-profit scientific research and testing organization managed by FM Global.

Four Way Floating Post: Connects four doors together to form a "+"

Fusible Link or Fuselinks: Simplest type of release device for use with fire rated products. 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. The most common temperature for a fire door is 165 degrees F.



Galvanizing: Zinc coating to protect steel against corrosion. Slats and hoods made of steel are galvanized. Optional on other steel surfaces.

Gauge (Gage): U.S. Standard that specifies that weight per square foot would be indicated by gauge numbers, i.e. 20 gauge. Used to describe metal thickness.

Gear End: An assembly consisting of a short inner shaft attached in the end of the barrel nearest the operator. Used to carry the driving gear or sprocket and transmit motion and torque to barrel.

Governor: Device on rolling fire door drive brackets to control rate of descent of rolling fire door when released in the event of fire. Also called Coiling Grille, Rolling Grille.

Grille: An upward acting rolling gate offering security without loss of visibility or ventilation. Widely used in shopping malls and parking areas.

Guide: The door side member consisting of two or more angles or an extruded aluminum shape to create a groove in which the rolling curtain moves up and down.

Guide Assembly: Consists of the door guide and a wall mounting angle or self supporting tube.

Guide Gap: The width distance of the guide groove channel.

Guide Lock: A cylinder-locking device mounted to the coil or fascia side of the guide assembly to
lock the curtain in the closed position (Should be furnished with electrical interlocks when a unit is motor operated.)

Guide Packoff: Depending on guide configuration, it is a term used to reference the distance from the face of the bracket or wall to the center of the guide or back edge of the guide.

Guide Standout: The distance that face-mounted guide assembly extends from wall face.

Guide Weatherseal: Weather-stripping material that is attached to the guide angle to compress against the flat surface of the curtain slats. The material may be vinyl, neoprene rubber or brush filaments.


Hand of Operation: The side on which the door operation mechanism is placed as viewed from the coil side of the door. Either RH or LH.

Hazardous Area: 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.

Header Seal: Weather-stripping mounted to opening header construction to seal the space between header and curtain. Normally used in place of, or in addition to, a hood baffle.

Headplates: End supporting plates for the barrel counterbalancing assembly. 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.

Headroom: Amount of clear unobstructed space required above the door lintel, ceiling or header.

Helical: A term referring to the type of torsion spring used in the spring counterbalance.

High Cycle Design: Door components and operator designed for heavy-duty use. Recommended when cycle operation is normally expected to exceed 20 cycles per day.

Hinges: Members that interconnect the wall panel sections and upright posts allowing wall panels to expand and collapse to create an operable accordion product. TRANZFORM unit hinges are continuous length, formed extruded vinyl and are colored to compliment the wall panel finish.

Hood: Sheet metal cover that conceals the door/grille coil and is attached and supported by the bracket plates and intermediate hood supports if required.

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. Normally made of neoprene vinyl.

Hood Bead: Stiffening bead (bend) or roll added to a hood to prevent sag.

Hood Support: A structural member that is contoured to the shape of the hood. It is attached to the door header. The hood is then fastened to the hood support to provide lateral support of the sheet metal hood only! Generally furnished on doors with over 12??? to 14??? hoods.

Hook Bolt Latch: Part of a lead post assembly that is manually activated by positioning a grip-type handle. Secures a lead post to a wall mounted striker post or a bi-parting post.

Housing: Sheet metal cover that conceals the door/grille coil and is attached and supported by the bracket plates and intermediate hood supports if required. Also known as Hood.


ICBO: International Conference of Building Officials. (Code Group.)

ICC-ES: International Code Council ??? Evaluation Services. (Code Group.)

Inertia Brake (stop lock bearing): A device that is attached to the door shaft and bracket plate, 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 an excessive RPM, the unit will lock up the shaft preventing it from moving until door can be repaired.

Inner Angle: The angle of a three-angle type guide assembly which forms the guide gap and is nearest to the fascia side.

Inner Shaft: The smaller steel shaft that projects through the barrel pipe at the adjustor side of the barrel assembly into an adjusting wheel or lug. (May be continuous and project at both ends on some push-up units.)

Inside Adjusting Wheel: Spring adjusting wheel located inside bracket plate so that no additional sideroom is required beyond the guide.

Integral Frame Unit (Labeled Integral Frame Unit): A complete ready to install counter door and factory welded hollow metal frame combination. Integral countertops are available. Units may wrap around wall if installation is done while the wall is under construction, or may be set into finished walls. Labeled (Fire Rated) units available. Also called Pass Window, or Package Units.

Interior Mounting: Rolling closure (door, grille or counter door) mounted on the interior face of wall or between jambs, but coiling toward the interior side of the building in either case. Term does not necessarily apply to operator.

Interlock: An electrical cutout switch to prevent motor operation if locking device is not first disengaged. Also see Motor Mounted Interlocks.

Intermediate Hood Support: A structural member that is contoured to the shape of the hood. It is attached to the door header. The hood is then fastened to the hood support to provide lateral support of the sheet metal hood only! Generally furnished on doors with over 12??? to 14??? hoods.

Intermediate Member: Vertical intermediate stiffening members of a side folding grille or a side folding closure. (Equipped with drop bolts.)

Intrinsically Safe: Refers to electrical equipment that, by its construction, should not permit sparking precipitating an explosion in hazardous areas. Permits use of standard control stations and sensing edge in explosion-prone environments. See Explosion Proof and NEMA.


Jamb: The vertical member that frames the side of an opening in the wall.

Jamb Angle (wall angle): The angle of the guide assembly that attaches to the wall and supports the load of the door assembly.

Jamb Load: Force exerted on jamb by guide assembly from weight of unit plus the load when curtain is subjected to wind load.


Key Switch: Optional electrical control device; key operated to open, close and stop.


Label (or Underwriters Label): The rating tag issued by Underwriters Laboratories or some other testing agency. Applies to fire doors, counter fire doors and smoke control assemblies.

Labeled Counter Fire Door: A miniature fire door approved by UL primarily used on smaller openings.

Lead Post: Solid vertical, extruded aluminum member that is provided with grip-type handles and acts as the operable leading edge of the partition. Mates with a striker or bi-parting post and contains a hook bolt latch to secure the unit when providing room separation.

Lift Handle: A handle supplied when required on manual push-up doors to assist in raising and lowering the curtain.

Light-Tight Doors and Counter Doors: Black-out construction for Cornell products that prevents light bleed.

Limit Switch: Device to limit opening and closing travel of motorized doors to eliminate over-travel.

Lintel Seal: Weather-stripping mounted to opening header construction to seal the space between header and curtain. Normally used in place of, or in addition to, a hood baffle.

Loose Bushing: A spring bushing that is fastened to the inner shaft only.


M100 FireGard™ System: Cornell fire door closing system: a slow closing system that utilizes a fire door motor operator. Can be tested and reset at floor level with the touch of a button. Available on counter fire doors and fire doors.

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 counter fire door.

Malleable Iron: Casting alloy used for endlocks and other components subject to shock or requiring good abrasion resistance.

Manual Override: Means of operating a motorized door by manual operation in case of power loss.

Master Keying: Arrangement whereby cylinder locks, although fitted with different keyed cylinders can be opened or locked by means of one "master" key.

Matadoor® : Trademarked Cornell product: break-away curtain section where the bottom bar is formed in three sections that allow the assembly to release from its guide upon impact. This avoids most curtain damage from accidents involving forklifts and other vehicles.

Mill Finish: Base finish as received from manufacturer; applies generally to aluminum and stainless steel. Will show extrusion die marks in aluminum.

Motor Cover: Metal cover to protect the motor from exterior weather, debris or to meet OSHA or UL 325 safety requirements.

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.

Mullion, Removable: A combined guide assembly joining two adjacent rolling doors, grilles or counter doors where center guide is removable to expose a full opening width.


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

NFPA: National Fire Protection Association. Establishes standards for fire door installation. NFPA Bulletin 80 ??? Standard for Fire Doors and Fire Windows is usually referred to in specifications.

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 building.

Noise Isolation Classification (NIC) (ASTM E336 & ASTM E413): A number used to describe the acoustical performance of ALL building elements in isolating one room from another. Normally used to test performance of products already installed in the field.

Noise Reduction Coefficient (NRC) (ASTM C423): The average of absorption coefficients at four key frequencies. Rating of the absorptive characteristics of a surface.

Nylatron: Manufacturers trade name for a slip-on extruded nylon shape impregnated with molybdenum disulfide solid lubricant and used on guide or track assemblies as a wear surface.



Operator: The actual mechanism that provides motion, such as chain operator or motor operator.

Outer Angle: The angle of a three-angle type guide assembly which forms the guide gap and is nearest to the coil side of the door.

Oversized Construction Label: A listing agency label applied to a fire door or counter fire door assembly in a size that has not been fire tested, but where the door design conforms to the construction requirements.


Package Unit (integral frame unit): A complete ready to install counter door and factory welded hollow metal frame combination. Integral countertops are available. Units may wrap around wall if installation is done while the wall is under construction, or may be set into finished walls. Labeled (Fire Rated) units available. Also called Pass Window, or Package Units.

Packoff (guide packoff and/or bracket packoff):

For guide packoff, depending on guide configuration, it is a term used to reference the distance from the face of the bracket or wall to the center of the guide or back edge of the guide.

For bracket packoff, dimension from fascia edge of bracket to centerline of guide gap.

Packout: Guide build-out to provide clearance for drive or tension mechanism when door is between-jamb mounted.

Panic Release Device: A wall mounted release handle used with an electric operator to permit emergency egress (exit). Normally furnished on grilles in Malls/Shopping Centers where building codes dictate. Device allows mechanical opening of the curtain without electrical power. Use of this device is restricted by curtain weight and other factors. Thumb turn cylinder locking required.

Pantograph: The inner metal framework assembly that supports and allows accordion operation of some types of side folding accordion products.

Pass Door (wicket door): 3??? x 7??? hollow-metal pedestrian door integrated into a rolling door. The frame of which is hinged at the jamb so the door and door frame swings out of the opening. Also called wicket door.

Perforated Slats: Rolling Door or Counter Door slats with multiple small punched holes that create a screening effect. Allows high security along with ventilation and visibility.

Pipe: Outer casing of the barrel assembly.

Pipe Shaft (barrel assembly): A steel tube or pipe that spans between the door brackets and contains the springs required to counterbalance the curtain weight. The curtain coils up around the barrel.

Pitch Plate: A special assembly affixed to the bottom bar of the curtain to accommodate sloped or irregularly shaped sills.

Plug End: An assembly consisting of a short inner shaft attached in the end of the barrel nearest the operator. Used to carry the driving gear or sprocket and transmit motion and torque to barrel.

Plumb Bar Support: Concealed diagonal bracing member used to provide vertical support for lead and bi-parting posts on taller sound rated accordion folding products.

Pocket, Stack Pocket: Framed receptacle to conceal door in "stacked" position. Built by the building contractor around the fixed end of the door.

Pocket Door: A hinged door assembly used to close off a pocket and conceal a fully stacked partition. May be supplied by accordion door manufacturer or others.

Polycarbonate: Thermoplastic used in sheet form. Impact strength and heat resistant. For vision panels and grille inserts. See VistaGard?? and VistaGlide?? .

Post or Mullion: A common guide assembly between two doors, grilles or counter doors. Can be provided fixed, hinged, or removable.

Powder Coating: A "paint" finish 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 and colors. See also SpectraShield?? .

Push Up: A door, counter door or grille that is counter balanced with torsion springs permitting operation by hand lifting with a force not exceeding 35 pounds.



Reelite: Mounted near the motor operator, is a self-coiling electrical cord to supply the electrical signal from the circuit of the sensing edge to the motor operator. Also called Take Up Reel.

Releasing Device: A device which holds a fire door automatic closing device until it receives a signal from a fire alarm or detection system and releases. If power fails the device also releases. There are a variety of models and features. Most have a time delay before release to prevent nuisance releases.

Ring: An inviolate shaped part (casting, stamping or extrusion) mounted at intervals on the counter balance shaft to insure smooth coiling or improve balance and for attachment of curtain to pipe.

Roller Assemblies: Consist of one or multiple nylon wheel, ball bearing rollers attached to a mounting stem for connection to wall panels. Multi-wheel trolley assemblies are provided at travelling lead posts while every wall panel is fitted with a single wheel roller assembly.

Rolling Door: Non-labeled, metal slatted door used to provide security against entry or weather protection at exterior and interior openings in industrial, commercial, institutional and other buildings. Roll upward and store in a tight coil above the opening. Also called Coiling Door, Rolling Door, Overhead Door.

Rolling Grille: An upward acting coiling gate offering security without loss of visibility or ventilation. Widely used in shopping malls and parking areas. Also called Coiling Grille.



Saf-T-Gard™ Governor: Trademarked Cornell product: a device that reduces the average closing speed of automatic fire door closing systems to between 6" and 24" per second, per NFPA 80.

SBCC: Southern Building Code Congress (Code Group).

ScreenGard Perforated Slats: Trademarked Cornell product: curtain slat perforations allow approximately 22% open space permitting air circulation while screening insects and providing security.

Sensing Edge: A device mounted on the underside of 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.

Sensing Edge, Electric: An electrical bottom bar astragal enclosed with two parallel foils. When a closing door bottom bar contacts an obstruction, the foils close an electric circuit to cause the operator to stop or stop-and-reverse the door.

Sensing Edge, Fail Safe: A sensing edge designed that should the sensing edge become damaged, the door will reverse to the fully open position and will either remain open until the sensing edge is repaired or require constant pressure on the close button to close the door.

Sensing Edge, Infrared Type: Bottom bar astragal enclosing a tube with an infrared transmitter at one end and a receiver at the other end. When IR source is obstructed the motor operator will stop or stop-and-reverse the door.

Sensing Edge, Pneumatic: An air chamber inside the bottom bar astragal is connected to a diaphragm switch, which signals the motor operator to stop or stop-and-reverse the door.

SentryGate® Grille: Trademarked Cornell product: grille constructed of molded nylon links and continuous metal rods for a 65% open design brick pattern curtain.

Service Counter Fire Door: A small version of a fire door that has a fire protection rating and will automatically close to a counter top in case of fire.

Service Door: Non-labeled, metal slatted door used to provide security against entry or weather protection at exterior and interior openings in industrial, commercial, institutional and other buildings. Roll upward and store in a tight coil above the opening. Also called Coiling Door, Rolling Door, Overhead Door.

Setback: The distance the guide is recessed from edge of the jamb at both sides of opening on face of wall-mounted door units.

Shaft Assembly: The tubular assembly consisting of pipe, springs and inner shaft upon which the curtain is coiled.

Shutter: A smaller metal slatted door assembly generally used to close off counter window wall openings. Also called Counter Doors.

Side Folding Grille: An accordion grille product that requires little headroom and no floor track. The grille is able to follow a curved line and stacks into a side pocket(s) in the wall. Also called side-sliding grilles, accordion grilles or Cornell VisionGlide.

Sideroom: Required unobstructed space on either side of the opening.

Single Slide: One operable wall panel with one fixed end and one latching end.

Slat: Cold roll-formed or extruded members that form the curtain. Slats are formed so as to interlock and form a water-shedding surface.

Slide Bolt: Locking device on bottom bar that slides into guide slot and is normally lockable.

Sliding Grille: An accordion grille product that requires little headroom and no floor track. The grille is able to follow a curved line and stacks into a side pocket(s) in the wall. Also called side-sliding grilles, accordion grilles or Cornell VisionGlide.

Sliding Jamb: Moves back and forth within a pocket as door is opened and closed. Is fixed so that the sliding jamb can not be pulled out of the pocket. Saves on wall panel material and required stack space.

Slip: Lateral distance that the curtain is allowed to travel within the guides before windlocks engage.

Sloped Bottom Bar: Also see Pitch Plate. 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 the opening on wide side unless door height is increased and coil raised to have sloped bar clear opening when door is open.

Smoke Detector: A device that senses visible or invisible particles of combustion and/or heat and is then capable of sending a signal.

Smoke Door (Shutter): Designed to limit smoke infiltration through the door opening. Equipped with perimeter smoke seals. Units close upon signal from smoke detectors or temperature rise.

Smoke Gasketing: UL listed or tested seals used on fire doors or fire shutters to reduce the passage of smoke and gases.

SmokeShield® Trademarked Cornell product: UL listed smoke and draft control assembly. Meets the requirements of Uniform Building Code, 1997, Section 7.210 for smoke and draft control door assemblies, as well as UL 1784 and NFPA 105 air leakage criteria.

S0 Cable: Oil resistant flexible electrical cable in take-up reel or in coil cord form that is sometimes specified for sensing edges.

Sound Transmission Classification (STC) (ASTM E90): The most widely accepted standard for ranking the acoustical performance of side folding accordion products.

Sound Transmission Loss (STL): Is the effectiveness of a barrier at preventing sound from getting from one side to the other, measured in decibels (dB).

SpectraShield®: Cornell trademark for powder coating finish.

Spring Counterbalance: Torsion spring assembly contained within the barrel assembly to counterbalance the hang weight of the door curtain and bottom bar.

Spring Cycle Life: Used to refer to the minimum cycle expectancy of the counterbalance springs.

Stand-out: The distance that guide assembly extends out from the wall on face-of-wall mounted doors.

Starter Slats: Partial slats used to connect curtain to barrel or barrel rings.

STC (Sound Transmission Classification)
55 Shouting not audible
50 Shouting barely audible
45 Loud speech barely audible
40 Loud speech audible, but unintelligible
35 Loud speech understood
30 Normal speech audible, but unintelligible
25 Normal speech easily understood

Stop Lock Bearing: A device that is attached to the door shaft and bracket plate, 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 an excessive RPM, the unit will lock up the shaft preventing it from moving until door can be repaired.

Stoppers: Bars mounted at top of guides to prevent bottom bar from traveling out of the guides when the curtain is fully raised.

Striker Post: Independent post that secures to the wall jamb. Mates with traveling lead post and is notched to accept a hook bolt latch.

Superimposed (Combo) Door: Combined assembly of a solid curtain door and an open design grille or door with connected guides and common bracket plates. Allows use of either the solid door or open design door on the same opening.

Superimposed Loads: Component loads of the reaction resulting from wind load on the door. Structure supporting the door shall be capable of resisting reactions due to eccentricities of these loads.

Sweep Seals: Flexible vinyl material mounted to the top and bottom of wall panels to provide an additional barrier to sound. Designed to close off the top and bottom gaps between the header construction and floor or countertop by providing light contact with the surrounding construction.


Take Up Reel: See Reelite.

Tandem Springs: Multiple springs in a line on the same inner shaft, as single springs, double springs or a combination of the two.

Tapered Bottom Bar: See Sloped Bottom Bar.

TEFC: Totally Enclosed, Fan Cooled motor operator specification that allows no ventilation on motor housing, but incorporates a fan to control most of the heat.

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.

TENV: Totally Enclosed, Non-Ventilated motor operator specification that allows no mechanical ventilation on motor housing.

Test Load: The Test Load, sometimes referred to as the "over load", is the load applied to the door system during wind load testing in accordance with ASTM E 330. The value of the Test Load is equal to 1.5 times the Design Load.

Thermiser® Door: Trademarked Cornell product: a non-labeled insulated door, normally used in exterior wall openings.

Three Point Lock: Key-operated locking device located at the center of a tubular bottom bar that locks into both guides and a hook latch bolt in the floor.

Three Way Floating Post: Connects three doors together to form a "T"

Three Way Switch: Allows door to switch to a second or a third track.

Through-Wall Fuselink: Extending a fuselink to the opposite side of an opening, with respect to the side the door is mounted on using a conduit.

Through-Wall Operation: A door driven by means of a hand chain, crank or motor operator that is located on the opposite side of the wall as the door coil.

Thumb Turn Cylinder: Locking device, much like a cylinder lock but does not require a key to lock or unlock. Supplied on the tenant side of the curtain only to allow emergency egress. Opposite side of the locking mechanism may be fitted with a standard key cylinder lock.

Tight Bushing: A spring bushing that is fastened to the outer pipe.

Timer to Close: An option for electric operators to automatically close at a predetermined interval after opening. Requires the use of a sensing edge to prevent damage or injury due to unsupervised operation.

Top Slat: A full-length slat on the uppermost part of the curtain assembly used for attaching the curtain to the rings or pipe.

Torsion Spring: A helical wound spring, commonly mounted inside a steel pipe, used to counterbalance the curtain.

Track: Extruded aluminum profile that mounts to the header construction and supports the door roller assemblies and operable wall panels.

Tube: See Pipe.

Tube Motor Operator: Totally concealed motor operator that mounts inside the barrel assembly. Reduces clearance requirements, but limits size and optional electrical features. For use on small counter doors.

Tubular Operator: See Tube Motor Operator.

Two Way Floating Post: Connects two doors together to form an "L"

Two Way Switch: Allows door to switch to a second track.


UL: Underwriters Laboratories - an independent, not-for-profit product safety testing and certification organization.

"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 other.



Viscous Speed Governor: Device to control the automatic closing speed of fire doors.

VisionAire® Grille: Trademarked Cornell product: an open grille formed of horizontal rods and vertical chain links.

VisionGlide™ Side Folding Grille: T rademarked Cornell product: side folding open curtain grille constructed of vertical aluminum tubes and horizontal chain links.

Vision Window(s): A single or series of single cutouts in a door, glazed with clear plastic. Configuration determined by customer. Cornell???s standard service door slat vision windows are 10" wide x 1 5/8" high. Also called Vision Lite, Vision Panel.

VistaGard Grille: Trademarked Cornell product: a rolling grille constructed of horizontal rods, clear polycarbonate panel modules, and vertical nylon links.

VistaGlide Side Folding Grille: Trademarked Cornell product: side folding grille constructed of continuous vertical interlocking aluminum pivoting sections fitted with panels of clear polycarbonate or solid aluminum.



Wall Angle: The angle of the guide assembly that attaches to the wall and supports the load of the door assembly.

Wall Mount Jamb:
Extruded shaped posts that secure to the wall at the fixed end of the operable partition and is the connecting point for the operable wall panels.

Wall Panels:
Operable accordion assembly made up of finished metal slats, hinges and post that is support by an overhead track, roller and trolley assembly.

WeatherGard Door: Trademarked Cornell product: rolling service door having full perimeter weather stripping, consisting of guide weather stripping, hood baffle or lintel seal and bottom bar astragal.

Wicket Door (pass door):3' x 7' hollow-metal pedestrian door integrated into a rolling door. The frame of which is hinged at the jamb so the door and door frame swings out of the opening. Also called wicket door.

Wind Bar: See Windlock Flat.

Windload: The amount of force a rolling door curtain can withstand without pulling out of the guide assemblies or taking a permanent set. To be specified in pounds per square foot. Also see Design Load and Test Load.

Windload Doors: Construction enhancements that allow doors to withstand higher wind loads.

Windlock Engagement: The point at which the windlock hook contacts the windlock flat.

Windlock Flat: Flat bar welded to the inner angle of the guide assembly for engagement of windlocks under wind load.

Windlocks: Malleable iron castings riveted at predetermined intervals to slat ends to prevent curtain from leaving guides under windload. Used in conjunction with wind bars in guides.

Windlock Strip: See Windlock Flat.

Working Turns: The additional winding of the springs as the barrel rotates and the curtain closes.


"Z" Guide: A face of wall mounted guide with the wall angle turned away from the opening. Normally used when mounting to masonry walls.



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