How to set up normally open fire doors and normally closed fire doors?

Fire doors usually refer to doors located in some enclosed places such as stair walkways, elevator rooms, cable shafts, flue gas ducts, etc. The role of the fire door is to meet the fire stability and heat insulation within a certain period of time, can prevent the spread and spread of the fire, and ensure the evacuation of personnel. It is an indispensable equipment in the fire fighting work.

What is the difference between a normally closed fire door and a normally open fire door?

Normally closed fire doors are usually closed, and they are pushed open when someone is walking. The disadvantage of normally closed fire doors is that they are installed in the passages and corridors of crowded places such as shopping malls, hospitals, etc., because passing people often move around. The fire door causes the fire door to be damaged and fall off quickly, forming a fire hazard.

Normally open fire doors are usually open, and automatically close in case of fire. Because it is kept open at ordinary times, it is convenient for people to pass through, and it is convenient for ventilation and lighting. It can be closed by itself in case of fire, which plays a role of preventing smoke and fire, ensuring fire safety and solving the problem of people passing by when the fire door is normally closed. Inconvenience and man-made damage.

Therefore, in the evacuation stairwells of some large shopping malls, normally open fire doors should be installed, which are usually open. In the event of a fire, various sensors are used to control the door closers to close the doors to block dense smoke.

How to set up normally open fire doors and normally closed fire doors?

Normal open fire doors should be used for fire doors installed in buildings where people pass by. That is to say, the fire doors in the public parts of the building, including the smoke-proof staircase, the front room of the fire elevator and the shared front room, should be normally open fire doors, and the fire doors in the evacuation aisles of the hall should also be normally open fire doors.

Except for the locations where normally open fire doors are allowed, normally closed fire doors should be used for fire doors in other locations. In the design, except for the normally open fire doors indicated in the drawings, all other fire doors should be normally closed fire doors. This requires the designer to indicate in the door and window table when choosing a normally open fire door, so that the examiner can Review accordingly.

Classification of fire doors

Fire doors can be classified into Class A fire doors, Class B fire doors, and Class C fire doors. Class A fire doors are called fully insulated fire doors, which can be simultaneously It meets the requirements of fire resistance, heat insulation, and integrity of fire resistance. The specific fire resistance levels are Class C fire doors, Class B fire doors, and Class A fire doors. Class B fire doors are called partially insulated fire doors, and their fire resistance is required to be 0.5h. Class C fire doors are called non-insulated fire doors, which have no specific requirements for fire resistance and heat insulation, as long as they meet the fire integrity within the specified time. Class A fire doors are widely used in daily use. The following is a specific introduction to Class A fire doors:

Fire Door Grade-Grade A

Class A fire doors in the classification of fire doors are an important part of fire protection equipment and an important step in social fire protection. The quality and use of Class A fire doors are related to the success or failure of fire protection. Class A fire doors are made of steel and wood. The fire resistance time of Class A fire doors is not less than 1.5 hours. Only when this is met can it be called Class A fire doors. Class A fire doors generally use perlite inside, and a small amount of fireproof materials such as vermiculite fire board, foam door core board, MC material, etc. are also used. The thickness of Class A fire doors is generally 50mm. Class A fire doors are generally installed in places with strict fire performance requirements.

Fire door rating-Class B

Class B fire doors in the classification of fire doors are widely used in home fire protection. It is a key step in home fire protection. The state stipulates that the production of wooden fire doors must be dried and flame-retardant. Among them, fire protection The hardware fittings used on the door must also be fireproof hardware fittings. The fire resistance time of Class B fire doors is not less than 1.0 hour. The use of Class B fire doors plays a very important role in the fire protection of our homes, so that our lives and property are well protected, and it plays an important role in home fire protection. The missing critical step.

Fire Door Grade-Grade C

The grade C fire door material in the fire door classification is generally cold-rolled steel plate and stainless steel, filled with environmentally friendly and healthy heat insulation materials. When a fire occurs, Class C fire doors can play a role in hindering the spread of fire and reducing smoke activities, providing valuable time for the evacuation of personnel, and ensuring the safety of personnel. The fire resistance time of Class C fire doors is not less than 0.5 hours, and the accessories used in Class C fire doors must be fireproofed to meet the specified fire resistance limits.