What are the differences between normally open and normally closed fire doors

The differences between normally open and normally closed fire doors are as follows:

1. The meaning is different. The normally open fire door is usually open, and will be automatically closed by the control system only in case of fire. It is generally used in the passage or corridor of public places. Normally closed fire doors are closed under normal conditions and in case of fire, and need to be pushed open when someone walks around, so as to prevent smoke and fire and prevent the spread of fire.

2. The price is different, and the price of the normally open fire door is higher, and the system is strong. The price of normally closed fire doors is relatively low. Henan fireproof doors and windows

3. The composition is different. The normally open fire door is composed of door leaf, door frame, door closer, sealing strip, release switch and other components. The normally closed fire door is equipped with sequencer in addition to the above components.

4. The control mode is different. The normally open fire door is controlled by the fire door release switch. The normally closed fire door does not need to be set with electric automatic control. It is mainly closed by the door closer and sequencer, that is, mechanical.

Precautions for fire door

1. The fire door shall be installed according to the type of fire door used, and the appropriate installation method shall be adopted.

2. The door frame of the fire door can be fixed with the wall by expansion bolts, or iron parts can be embedded at the opening when building the wall, and welded firmly with the door frame connector during installation.

3. No matter what kind of connection mode is used between the door frame and the wall, there should be no less than 3 anchor points on each side, and they should be firmly connected. Henan fireproof doors and windows

4. When installing the fire door, it should be aligned and hoisted. After the size is appropriate, it should be temporarily fixed, corrected and adjusted. The connection and anchorage can be carried out after there is no error.

5. The sliding door shall be flexible after installation; The side hung door is easy to open and tight and firm to close. Henan fireproof doors and windows

6. Door closers must be installed on fire doors, and sequencers must be installed on opposite doors.

7. The handle, fire lock and other hardware accessories on the fire door must be complete.

8. It is required that the clearance from the ground plane shall not be greater than 5mm.