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A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.
Hörmann is a German manufacturer of doors, garages, door frames, and gates for commercial and private real estate. [1] Operating globally, the family-owned business is Germany's largest door producer and the fourth biggest door manufacturer in the world.
Shutter (photography), a photographic device that administers the exposure by limiting the time over which light is admitted; Shutter, a device used to manipulate pulses of light in a signal lamp; Movie projector shutter, used to interrupt the emitted light during the time the film is advanced to the next frame; Remote shutter, in a selfie stick
A roller shutter or sectional overhead door is one variant of this type. A tambour door or roller door is an up-and-over door made of narrow horizontal slats that rolls up and down by sliding along vertical tracks; it is typically found in entertainment centres and cabinets.
A typical single-car garage roller door has a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door. Oversized roller doors in commercial premises are not sprung (except in the US), and a manual pulley and chain system or a geared motor is used to raise and lower (roll up and roll down) the door.
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