How to distinguish normally open fire doors from normally closed fire doors on drawings

Normally closed fire doors are independent and have no connecting wires. Look at the electrical drawings. If the door has wires and modules, it is a normally open fire door.

Fire door refers to the door that can meet the requirements of fire stability, integrity and heat insulation in a certain period of time. It is a fire zone with a certain fire resistance limit, located in fire zones, evacuation staircases, shafts and so on.

Fire doors not only have the function of ordinary doors, but also have the function of preventing fire and smoke from spreading, which can prevent the fire from spreading in a certain period of time and ensure the evacuation of people.

Extended data

Key points of fire door inspection

(1) Whether the fire door frame, door leaf, door closer and other parts are in good condition.

② Whether the releaser is sensitive when the normally open fire doors are closed, whether the double normally open fire doors are closed in turn, and whether the normally closed fire doors can be closed automatically.

(3) Whether the fire door is closed and whether it has good fire and smoke isolation effect.

(4) Whether sundries are piled up in front of the fire door.

People's Network-19 Knowledge points that fire safety inspection owners should master.