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Some doors are designed to stay open under normal circumstances, and close automatically in the event of a fire. Whichever method is used, the door's movement should never be impaired by a doorstop or other obstacle. The intumescent and smoke-seal bounding of fire doors should be routinely checked, as should the action of the door closer and latch.
During a fire, any door that penetrates a firewall must be fire-rated. Fire doors need to be closed in case of fire to help prevent the spread of fire and smoke. Any fire doors which are normally held open must automatically close and lock when a fire is present in the building. The function of an emergency exit rim device (crash bar or panic ...
Many fire doors do not lock, to allow building occupants to move within the building to find an exit easily. On the other hand, security doors may close, latch, and lock, to prevent passage. Other designs are used to secure sliding or overhead doors similarly, holding them open until a signal to release the doors to close automatically.
The device demagnetizes to allow automatic closure of the door on command from the fire control or upon failure of the power source, interconnection, or controlling element. Stored energy in the form of a spring or gravity can then close the door to restrict the passage of smoke from one space to another in order to facilitate evacuation and ...
Mechanical fusible links are utilized as the triggering device in fire sprinkler systems and mechanical automatic door release mechanisms that close fire doors in warehouses, etc. Fire dampers in ventilation systems have fusible links so that the dampers close automatically in case of fire, limiting the spread of flame or hot gases through a ...
In case of power outage the coiling fire door does not need to close, but must be capable of automatic closing when given a signal from the building alarm systems or smoke detectors. A temperature-sensitive fusible link may be employed to hold the fire doors open against gravity or a closing spring. In case of fire, the link melts and releases ...
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