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Custom Rolling Grilles & Closures - Commercial Applications

Rolling Grilles & Closures Glossary
Every field of business has a unique language - rolling closures and grilles included. That's why we thought a Glossary of terms would be helpful.
If you have any questions, suggestions, or ideas on how we can be more helpful please Email us at

ADA American Disabilities Act requires locking to be accessible within the following height restrictions: 9" minimum - 54" maximum off floor.

Adjustable Lock Strike Adjusts easily on site to floor surface so bottom bar is tightly secured when lock rod is engaged.

Adjusting Wheel See "Charging Wheel".

Anodize An electrolytic etched finish forming a hard protective film on the surface of aluminum. Clear, bronze, gold and black are the most common colors.

Astragal Protective bumper attached to the bottom bar that seals to the floor or counter.

Barrel Assembly Steel barrel with a drive shaft at one end and a tension shaft on the other. The counterbalance spring assembly is inside the barrel. Rings may be attached to the barrel. Deflection of the barrel may not exceed .03 per foot.

Barrel Rings Used to raise offset from counterbalance barrel where the top slats of a curtain are attached.

Base Plates Optional steel plates mounted under the support tubes to help distribute weight of the grille or closure on the floor.

Bell Mouth Flared upper portion of guides to allow easy entry of the grille/closure curtain

Between Jamb Mounted Guides are mounted to wall directly facing into opening and are often in a pack-out configuration. This mounting could require inside charging wheel and fascia.

Bottom Bar A heavy-duty aluminum extrusion attached to the bottom of the curtain. Optional bottom bar plate and astragal. Locking is located in the center of the bottom bar. ADA requirements locate locking higher on curtain. Dual angels in lieu of aluminum extrusion available on some models.

Bottom Bar Plate Mounted to underside of bottom bar for reinforcement and conceals slot in ceiling.

Bracket Plates Mounted to the support tube or the angle of the guide assembly. Bracket plates support the barrel assembly on the shafts at each end. These plates also support a motor mounting bracket and hood if required. Size of plates determined by coil size.

Chain Hoist A mechanical operator using a continuous hand chain and gear reduction to lift grille or closure.

Charging Wheel Winds tension to the counterbalance spring assembly and is locked in place to the outside of a bracket plate with a tension pin.

Clear Opening Actual opening left after the grille/closure is installed. Coil, guides, tubes and angles are not part of the clear opening.

Closure Rolling curtains made of tempered glass, polycarbonate, high impact extruded polymer, solid aluminum and perforated steel slats.

Coil Barrel assembly and curtain in rolled up position.

Coil Cord Electric wire in a tight coil stretching and retracting from the sensing edge on the bottom bar to a junction box located at mid-door height that is wired to the electric operator.

Coil Side Side of the curtain that the barrel assembly and bracket plates protrude.

Constant Contact Electric operator activating the open or close cycle only when the key switch or push button control is depressed. The operator will stop if pressure is released.

Counter Grille/Shutter A grille or closure that is not a walk through opening

Counterbalance Spring Assembly Located inside the barrel and consists of the torsion spring, spring plugs and tension shaft.

Crank Operation A mechanical operator using an awning or wall mounted gearbox with removable handle.

Curtain Grille - Rods and links of aluminum, stainless or galvanized steel assembled in grille pattern of choice with attached bottom bar. Closure - Slats of aluminum or HIEP assembled with end locks making a door or shutter with attached bottom bar.

Cylinder Locks Keyed mechanism operating a locking device located on the bottom bar.

Drive Shaft Fixed to one end of the barrel and requiring a gear/sprocket engaging by chain an electric motor, crank or chain hoist to lift grille/closure.

"E" Guide Face of wall mounted guide on an angle that faces the opening, usually used on steel jambs.

Electrical Interlock Prevents motorized operation when bottom bar is locked.

Electric Safety Edge Mounted to the underside of the bottom bar, this highly sensitive, electrically actuated device will stop and reverse upon hitting an obstruction.

Emergency Egress Release A pull handle that is flush mounted into a wall adjacent to a motorized grille. A simple cable system releases the motor from the drive shaft. The grille is "over sprung" so when the motor is released the grille lifts off the ground for emergency egress. Meets ADA requirements.

Emergency Hand Chain
Emergency Hand Crank
Used when the electric motor fails to operate. This is a mechanical means of operating a grille/closure after engaging the emergency disconnect on the electric operator.

End Locks Fixed on both ends of every other slat to prevent curtain slats from shifting laterally.

Extended Shaft Drive shaft lengthened to accommodate a gear/sprocket for other than push-up operation.

Exterior Refers to the side of the curtain that faces the unsecured area.

Face-of -Wall An electric safety edge with an additional feature of retracting the grille/closure to the open position when edge gets damaged.

Fascia Optional sheet metal cover used when no header is in place and the standard hood leaves exposed the back of the coil.

Galvanizing Zinc coating to protect steel against corrosion.

Grille A security gate constructed of rods and links offering visibility and ventilation that rolls in a coil upward.

Guides Side tracks of aluminum or steel that retain the curtain in the opening.

Hand of Operation Side of the barrel assembly with the drive shaft looking from the coil side.

Head Plates See "Bracket Plates".

Headroom Unobstructed clearance above opening.

HIEP High impact extruded polymer with Class A fire and smoke ratings.

High Cycle Springs Optional extended life spring assembly for high usage grilles or closures.

Hood Covers the barrel assembly and is supported by the bracket plates and hood supports. Hoods can be made of various materials including galvanized steel, stainless steel, aluminum and vinyl.

Hood Supports Rigid brackets that fit around the center of the coil, bracing hood to keep its shape and reduce sag.

Inside Charging Wheel Attached inside the bracket plate and used only when no side room is available. Grille or closure size and weight will limit usage. See "Charging Wheel".

Interior Refers to the side of the curtain that faces the secured area.

Jamb Cripple Space on either side of opening for support tubes, angles, guides and bracket plates.

Key Switch Key activated electrical control device for electric motors. Motor can be wired for constant or momentary contact operation.

Locking Keyed cylinder operated device mounted in center of extruded bottom bar throws locking bars into guides to prevent lifting of curtain. ADA lock height location available. Simple slide bolts with hasp are available on some models.

Mill A raw metal finish referencing aluminum or stainless steel.

Momentary Contact Electric operator activated to complete a full opening or closing cycle upon momentary contact of the key switch or push button control.

Motor Term often used to describe an electric operator that moves the grille or closure up and down.

Motor Mounting Bracket Supports motor from bracket plate or wall on drive shaft side of barrel assembly.

Pack Off See "Stand Out".

Pack-Out Used for between jamb mounting of guides to provide clearances from obstructions and space for tension shaft and drive shaft.

Panic Release Device See "Emergency Egress Release".

Pipe Assembly See "Barrel Assembly".

Pneumatic Sensing Edge A "rubber bumper" with an air system mounted to a bottom bar that will upon hitting an obstruction, signal the electric operator to stop and reverse.

Polycarbonate Impact resistant and flame-retardant thermoplastic, far stronger than acrylic and Plexiglas used for vision panels.

Power-Out Entry Terminal (POET) Used when a motorized grille is the only entry and power is out. A keyed emergency egress release concealed in a tamperproof steel security box, accessible from the exterior. The POET releases the motor and allows for push-up operation.

Push Button Station Standard three button control device including open, close and stop, provided with electric operators.

Removable Soffit Allows for easy full width access when barrel assembly is mounted above the ceiling.

Retractable Reel Electric wire in a retractable take up reel from the sensing edge at the bottom bar to a junction box located at mid-door height that is wired to the electric operator.

Shutter See "Counter Grille/Shutter".

Side-room Space on either side of opening for support tubes, angles, guides and bracket plates.

Slat An extruded or cold roll-formed continuos profile designed to interlock, fabricating a curtain.

Slide Bolt Lock Separate hasp type locking units mounted to each side (left/right) of the bottom bar.

Sloped Bottom Bar An extended bottom bar tapered to match a sloped floor.

Spring Counterbalance See "Counterbalance Spring Assembly".

Stand Out The distance from the center of the guide to the closest edge of the bracket plate.

Stops Catch-type obstructions mounted at the top of the guides to prevent the bottom bar from leaving the guides when the curtain is fully raised.

Support Tubes 3" x 3" 20' and 4" x 4" x 20' structural tubular steel, factory drilled and tapped for guides and bracket plates. This self-supporting system allows rolling grilles or closures to mount directly to concrete slab and ceiling joists.

Take-Up Reel See "Retractable Reel".

Tension Shaft Located opposite the drive shaft on the barrel assembly. Attached to spring counterbalance assembly and charging wheel to add tension to spring.

Tension Wheel See "Charging Wheel".

Thumb Turn Lock Thumb turns are required by fire laws in many areas. This non-removable key like knob fixed to a cylinder is used as an alternative to a keyed cylinder. Requires a protective cup and security pattern on rolling grilles to prevent unauthorized entry.

Torsion Spring A helical wound spring mounted inside the barrel used to counterbalance rolling grilles or closures.

Winding Wheel See "Charging Wheel".

"Z" Guide Face of wall guide mounted on an angle that faces away from the opening usually used on masonry or wood jambs.

Interior Folding Doors
Finishes & Finish Options
More choices!
Clear anodized is standard on all our models. Optional color anodizing and hundreds of powder coat and acrylic paint finishes are available.

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