Steel fire door is now a lot of useless for the markets, but most of them are used in the construction of open firewall, normally used for traffic, evacuation corridor, stair between inward and outward, the place such as wellhead pipes, at the time of fire can rise to prevent flame spread and prevent the combustion flue gas flow, at the same time, have the effect of sealing.

Its basic structure is: door frame made of steel (cold rolled or galvanized, etc.), door leaf sides panel for steel (cold rolled or galvanized, etc.), part of the fire door two panels inside is lined with inorganic non-combustible fire prevention board, to strengthen the doors of cold-rolled steel plate, stiffener and connection with spot welding panel, door leaf fill in heat insulation material. Door - fan paneled glass adopts fireproof glass with the same level of fire resistance of the door, and seal material (fireproof seal bar, aluminum silicate fiber blanket, etc.) is installed in the slot of the door frame and the middle of the door. In addition, different functions of fire lock, hinge, door clover, sequentially, latch, etc. All hardware products must be tested by the national fixed fire testing center. Code name: GFM.

Among them, according to the number of doors, steel single door and steel double door fire doors; According to the door fan structure, the steel and glass fire doors and the steel without glass fire doors are distinguished. Grade a fire doors, class b fire doors and class c fire doors are divided according to the fire-resistance limit

According to the gb12955-2008 fire door standard

The name of the

Fire performance

Code name

Insulated fire door

(class A)

Fire resistance is greater than 0.50 h

Refractory integrity is greater than 0.50 h

A0.50 (c)

Fire resistance is greater than 1.00 h

Refractory integrity is greater than 1.00 h

A1.00 (class b)

Fire resistance is greater than 1.50 h

Refractory integrity is greater than 1.50 h

A1.50 (class a)

Fire resistance is greater than 2.00 h

Refractory integrity is greater than 2.00 h

A2.00

Fire resistance is greater than 3.00 h

Refractory integrity is greater than 3.00 h

A3.00

Partially insulated fire doors

(B)

Fire resistance is greater than 0.50 h

Refractory integrity is greater than 1.00 h

B1.00

Refractory integrity is greater than 1.50 h

B1.50

Refractory integrity is greater than 2.00 h

B2.00

Refractory integrity is greater than 3.00 h

B3.00

Non-insulated fire doors

(C)

Refractory integrity is greater than 1.00 h

C1.00

Refractory integrity is greater than 1.50 h

C1.50

Refractory integrity is greater than 2.00 h

C2.00

Refractory integrity is greater than 3.00 h

C3.00