The sealed door is used in the passage from the underground main substation and main drainage pump room to the underground parking lot, which is easy to close to prevent sudden water infiltration. The door leaf of this secret door is welded together with flat steel plates, cross shaped reinforcement plates, and ring beams.

What is the general location where fireproof doors are installed

1. Enclosed evacuation stairs leading to corridors; Enclosed elevator lobby, doors leading to the front room and the front room leading to the aisle.

2. Inspection doors for vertical pipeline shafts such as cable shafts, pipeline shafts, smoke exhaust ducts, and garbage chutes.

3. Divide fire zones and control the fire walls and doors on the fire partition walls set up to control the building area of the zones. When it is difficult to install firewalls or fire doors in buildings, fire-resistant rolling shutter doors should be used instead, and water curtains should be used for protection.

What are the types of fire-resistant sealed doors

1. According to different fire resistance limits According to different fire resistance limits, the international standard (ISO) for fire doors is divided into three levels: A, B, and C.

① Fire doors Its fire resistance limit is 1.2 hours, usually for all steel plate doors and roof glass windows The purpose of the A-line fire door is to prevent the expansion of the fire during a fire;

② Class B fire door Its fire resistance limit is 0.9 hours. It is a fully steel door with a small glass window on the door. The glass is made of 5mm thick laminated glass or fire-resistant glass The main purpose of Class B fire doors is to prevent the spread of fire at the opening during a fire Wooden fire doors with good performance can also reach Class B fire doors;

③ Class C fireproof door His fire resistance limit is 0.6 hours, and it is a fully steel plate door with a small glass window on top. The glass is made of 5mm thick laminated glass Most wooden fire doors are within this level range.

2. Divided according to the different materials According to the different materials, fire doors are divided into two types: wooden fire doors and steel fire doors

① Wooden fireproof door Apply fire-resistant coating on the surface of wooden doors, or use decorative fire-resistant adhesive veneer to meet fire protection requirements Its fire resistance is slightly inferior;

② Steel fireproof door It is made of ordinary steel plates and filled with fire-resistant materials such as rock wool in the interlayer of the door leaf to meet fire prevention requirements.

The fireproof airtight door is normally closed and needs to be pushed open when personnel move around. The opening state of fireproof doors has certain drawbacks, as the installation location of fireproof doors is usually a passage where personnel often walk, causing certain conflicts. Especially in large shopping malls where there is a high flow of people, if normally closed fire doors are installed in the evacuation stairwells, due to frequent opening and closing, the fire doors will quickly be damaged and fall off, thus failing to provide fire protection and posing a fire hazard.