Normally open fire doors have 4 closing methods

Fire doors are also a common fire-fighting facility in daily fire-fighting facilities.

Fire doors are classified according to their fire resistance:

1. Insulated fire doors:According to different fire resistance times, heat insulated fire doors are divided into Class A fire doors, Class B and Class C fire doors. The fire resistance limit of Class A fire doors is not less than 1.5 hours, Class B is 1 hour, and Class C is 0.5 hours. They are installed in different places, such as fire walls, evacuation stair doors and solid well inspection doors.

2. Non-insulated fire door:This kind of fire door can meet the requirements of fire resistance integrity and general insulation within the specified time. But it cannot maintain the internal temperature in a fire like an insulated fire door.

Classification by material:

1 .Wood-proofFire door

2. Steel fire door

3. Steel and wood fire door

Classification by door leaf structure:

1. Fire door with window: The door leaf has a partially transparent window

2. Fire door without window: no transparent window on the door leaf

3. Single leaf fire door: only one door leaf

4. Multiple fire doors: composed of multiple door leaves

Normally open fire doors have multiple closing methods:

1. Linked shutdown: Trigger two independent fire detectors or one independent fire detector plus a manual alarm button through the same fire partition

2. Remote closing: Manually close the normally open fire door through manual operation of the fire linkage controller bus panel

3. Fire door monitor: Close the normally open fire door through manual operation of the fire door monitor Door

4. Manual closing on site: Close the normally open fire door by clicking the fire door release button