Fire shutter door http://wangsjgcw.gongchang/ Normally closed fire door does not open often?
Fire evacuation passages are strictly prohibited to stack items. It is the door to life when people escape to life. Normally closed fire doors are "closed but not locked". This is something people don't understand and is often overlooked.
The normally closed fire door effectively prevents the rapid flow of high temperature smoke and harmful gases in the event of a fire, allowing personnel to escape in time.
In order to ensure that the fire door can function effectively in the event of a fire, the normally closed fire door must be kept closed, and the normally open fire door can be normally closed in the event of a fire. In addition, fire passages are strictly prohibited from being occupied or blocked, and the location of evacuation marks must be standard.
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