Invention Grant
US09175513B2 Fire door method of operation 有权
防火门操作方法

Fire door method of operation
Abstract:
The present invention presents a method to permit emergency egress through an access opening covered by an overhead coiling fire door. Upon receiving an alarm notification from a first detector located on one side of the access opening the door is power closed to a predetermined height and held there for the predetermined time, then power closed to a fully closed position. Upon receiving a second alarm notification from a second detector located on the opposite side of the access opening the door enters into a secondary alarm condition. The door is power closed and awaits notification to initiate a secondary emergency egress sequence. The secondary emergency egress sequence comprises receiving a door opening notification, opening the door, holding the door open for a predetermined time, and reclosing the door. Upon primary power restoration or a return to a non-alarm condition the door returns to its preset open position.
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