The difference between Class A fire door and Class B fire door

Due to the inevitability of fire protection, fire doors are used more and more around us. So how do we distinguish the grades and differences of fire doors? In 2009, the country had a new national standard for fire doors, which divided the fire doors into different levels. Divided into Class A fire doors, Class B fire doors, Class C fire doors. Class A fire doors and Class B fire doors are widely used in our daily lives. Fire prevention facilities in public places are indispensable. For example, fire doors are usually installed in staircase passages, which can prevent the spread of fire. Fire doors are also used in home decoration. So, what is the difference between Class A fire door and Class B fire door?

1. Different fire resistance limits

As a key step for home fire protection, fire doors play a particularly important role. According to the fire resistance limit and heat insulation performance: Class A fire door is not less than 1.5 hours; Class B fire door is not less than 1.0 hour; Class C fire door is not less than 0.5 hour. We can choose according to different needs, but now generally used are Class A fire doors and Class B fire doors.

There are many types of fire doors, and the materials used are also widely used, such as stainless steel fire doors, glass fire doors, and steel fire doors. One of the most important characteristics of fire doors is the fire resistance limit of fire doors.

The fire resistance limit of Class A fire doors is between 1.50 and 2.00h, and the fire protection time of the fire doors is not less than one and a half hours. After this time, the fire performance is greatly reduced.

The fire resistance limit of Class B fire doors is between 0.50 and 1.50h, and the fire resistance time of its fire doors is not less than one hour, which is shorter than that of Class A fire doors.

2. Different materials

The difference between Class A fire doors and Class B fire doors is the difference in fireproof materials.

Fire doors are mainly composed of four types of door closers, door panel materials, door frame materials, and fire panels. Class A fire doors are made of 08 materials of better quality, and their service life is generally between 5 to 8 years, and their door panels are relatively thick. The Class B fire door materials mostly use wood and steel materials, and their thickness is much lower than that of Class A fire doors, and their service life is not as long as Class A fire doors.

The thickness of the built-in fireproof rock wool board, the thickness of the rock wool board of the Class A fire door is 52mm, and the thickness of the rock wool board of the Class B fire door is 46mm. As a result, the fire protection time of the Class A fire door is longer than that of the Class B fire door. Long, the fire performance of Class A fire doors is better.

3. Different locations

Class A fire doors and Class B fire doors are used in different places. Generally Class A fire doors are used in some important places, such as private room doors, power distribution doors, and equipment rooms of automatic fire extinguishing systems in high-rise buildings. , Ventilation, air-conditioning machine rooms and other important fire passages and flammable and explosive public places, while Class B fire doors are generally used in relatively ordinary fire passages, such as enclosed staircases, smoke-proof staircases, and fire elevators. Room door and other places. Compared with Class A fire doors, the scope of use is wider, and it can be seen everywhere in schools, homes, and many office places.

Class A fire doors are the highest category of fire doors, and Class A fire doors have the best fire performance. In the installation, we should make reasonable arrangements according to the site conditions of the building, so that the fireproof performance of the fireproof door can be greatly improved.