A roller shutter, roller door or sectional overhead door is a type of door or window shutter consisting of many horizontal slats (or sometimes bars or web systems) hinged together. The door is raised to open it and lowered to close it. On large doors, the action may be motorized. It provides protection against wind and rain. In shutter form, it is used in front of a window and protects the window from vandalism and burglary attempts.

Shutters and Rollers
Types and operation

Built-on Roller Shutter Doors
Describes the type where the roller shutter box is fixed to the exterior of the building facade.

Built-in Roller Shutter Doors
Where the roller shutter box is built into the lintel above the window.

Integrated roller shutter
A roller shutter and window combined as a single unit.

Roller shutter with tilting laths
A roller shutter with laths that tilt, similar to an external venetian blind.

With gear drive from the shutter roller traced through the building facade to a universal joint on the room side that is operated by a cranked winding handle.

Manual tape
A tape drive around a flange on the roller is traced through the building facade with pulley guides to an inertia reel on the room side.

With a tubular motor fitted within the roller. Automatic operation can be added.

Fire Shutter​
Can either be manual roller shutter or electric roller shutter, which uses Woods Metal and a weight bar to close the roller shutter or can be linked to Fire Alarm System to close automatically on event of fire alarm activation.