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Axle Assembly: A horizontal member at the head of the opening that supports the curtain and contains the counterbalance spring(s).

Axle Collar: Cylindrical component used to center the axle assembly between the support brackets.


Bottom Bar: A reinforcing member at the lower edge of a bottom curtain panel.

Brackets: Support members above the top of the wall opening to which the axle assembly is attached.


Commercial Door: A rolling sheet door typically used in other than self-storage applications.

Counter Shutter: A door used to close an opening, which closes on a counter-type sill.

Counterbalance Assembly: An assembly consisting of torsion springs, spring anchors, and a shaft, which is positioned on the axle assembly.

Curtain Latch: Locking device attached to the exterior side of the curtain, which slides into the guide, and is used to secure the curtain in the closed position and is equipped for padlocking.

Curtain Panel: Formed metal sheet consisting of multiple corrugations with horizontal hems. Curtain: An assembly of curtain panels seamed together.

Curtain Stops: See Stops.

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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Dead Axle: Axle assembly that remains stationary when the door is operated.

Door Only: Axle assembly, curtain and bottom bar.

Door Sheet: See Curtain Panel.

Drum: A cylindrical component attached to the support shaft, which is used to support the roll diameter of the curtain.

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Extended Brackets: Support brackets that increase the distance between the door shaft and the header.

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Felt Strips: Vertical cloth adhered to the curtain to reduce paint wear and noise.

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Guide: Vertical assembly in which the curtain travels and that is fastened to the jamb, retaining the edges of the door curtain and closing the space between the curtain edges and the jamb.

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Hem: Interlocking “hooks” on the top and bottom edge of the curtain panel used to create a seam.

Head Stops: See Stops.

Header Seal: Material attached to header with flap resting on face of curtain when door is closed, and designed to retard air infiltration over top of curtain.

Hood: A sheet metal housing that mounts horizontally over the coiled curtain and brackets, serving as a cover for the coiled curtain and closing the door space between the door coil and the header.

Hood Baffle: A flap of material with one end secured to the interior of the hood and the other end resting on the curtain, and designed to retard air infiltration over the top of the curtain and through the hood.

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Interlock, External: An electrical switch to prevent motor operation if locking device is engaged.

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Jamb Clip: Steel angle used to secure guides to concrete or masonry jambs.

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Lift Clip: See step plate.

Live Axle: Axle assembly that turns with the door when operated.

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Mini Door: A rolling sheet door typically used in self-storage applications.

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Saddle: Component used to cradle and secure the axle to the brackets.

Seam: Method of permanently interlocking two consecutive curtain panel hems for creation of the continuous sheet door curtain.

Side Draft Stop: Material attached to the guides used to close the gap between the door curtain and the guide when the door is in the closed position.

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.

Spring Anchor: A component in a counterbalance assembly, that holds a spring in place while it is under tension.

Spring Hook: A formed end of the counterbalance spring wire used to facilitate assembly.

Steel Mounting Plates: Heavy gauge steel plate or angle used to secure support brackets when field conditions do not have adequate structure to anchor brackets.

Step Plate: Plate installed on the bottom bar used to push the door tight to the floor with foot when engaging locks, and also used to prevent bottom bar from passing stops when curtain is raised.

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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Tensioning Device: A component attached to the counterbalance shaft, which controls the spring tension as it is locked to the bracket.

Top Draft Stop: Material attached to the curtain, and used to close the gap between the door curtain and the header when the door is in the closed position.

Top Sheet: Flat sheet or curtain panel attached to the axle assembly.

Torsion Spring: A helical wound spring in a counterbalance assembly, used to counterbalance the curtain.

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Wear Strips: Material attached to the curtain or guide to reduce paint wear and noise.

Wind Bar: Channel or bar attached to guide, which engage windlocks under wind load.

Windlock: A component which is attached at predetermined intervals to sheet ends to prevent curtain from leaving the guides under wind load, and which are used in conjunction with wind bars inside the guides.

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Roll Up Door Depot

Sunday 21st of January 2018

Residential / Mini Roll Up Doors
Commercial Rol Up Doors