Why are normally closed the fire door closed

- Nov 04, 2016 -

Fire doors-activity of fire separated into open normally closed fire doors and fire doors. Normally closed door only when it is closed, after a fire in order to effectively block the invasion of fire and smoke, at a certain time, fire door with fire, smoke and blocking temperature and other functions.

Normally closed the fire door in the event of fire, slow down the fire and smoke spread to stairways, fire exits, for evacuation to win precious time. Therefore, in order to keep closed the fire door is in the closed state, it must not be easy to open, or in anti-theft door lock.

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