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The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position.
A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
A night latch (or night-latch or nightlatch) is a lock that is fitted on the surface of a door; it is operated from the exterior side of the door by a key and from the interior (i.e. "secure") side of the door by a knob. [1] [2] [3]
Closing all interior doors helps disperse the pressure throughout your home, reducing the effect that all of that force can have on your roof — basically the one thing that separates you from ...
Some jurisdictions permit doors to latch to each other. For security, additional latching points may be added. For example, upper and lower vertical rods added to one door and connected to the leaf with no rods via a mortice latch. A double door coordinator is used to ensure the active leaf does not close before the inactive leaf. This ...
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Doors fitted with this handle have a latch that keeps the door shut. The door handle has only a lever handle or knob which operates this latch. Pushing the handle down rotates the spindle, operating the tubular latch mechanism inside the door, allowing it to be opened. [2] This type of door handle is used on interior doors that do not require ...
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