How many grades are there for fire doors? How does the fire door grade divide?

- Apr 11, 2019-


Fire door grade 1, fire resistance limit

It can be divided into three levels: a, b and c.The fireproof limit of class a fire door is 1.2h, the fireproof limit of class b fire door is 0.9h, the fireproof limit of class c fire door is 0.6h.

Applicable to fire doors of different grades:

Class a: equipment room (such as fire pump room, power distribution room, generator room, smoke exhaust air machine room, etc.) door, fire division, fire wall door;

Class b: closed stairwell door, stairwell front door, smoke proof stairway and fire fighting elevator Shared front door, fire fighting elevator Shared front door, directly open front door or Shared front door;

Class c: vertical shaft doors, such as strong electric Wells, weak electric Wells, pipe well doors, air conditioning room.


Fire door grade 2, material

Can be divided into steel fire doors, composite glass fire doors and wooden fire doors.

Fire door grade 3, structure

Can be divided into a single fire door, double fire doors, with bright son fire doors, glass fire doors and shutter fire doors.

Class a: equipment room (such as fire pump room, power distribution room, generator room, smoke exhaust air machine room, etc.) door, fire division, fire wall door;

Class b: closed stairwell door, stairwell front door, smoke proof stairway and fire fighting elevator Shared front door, fire fighting elevator Shared front door, directly open front door or Shared front door;

Class c: vertical shaft doors, such as strong electric Wells, weak electric Wells, pipe well doors, air conditioning room.


Fire door level 4, fire door level can be divided into A class of fire doors, class B fire doors, class C fire doors.

A class: this kind of fire door is called complete adiabatic fire door again, can satisfy at the same time inside specified time fireproof insulation sex and fireproof integrity demand, fireproof grade is 0.5h(class c), 1.0h(class b), 1.5h(class A) and 2.0h, 3.0h respectively.

Class B: also known as part of the heat insulation fire doors, its refractory insulation requirements for 0.5h, fire-resistant integrity classes are 1.0h, 1.5h, 2.0h, 3.0h.

Class C: also known as non-thermal insulation fire door, no requirement for its fire-resistance and heat insulation, in the stipulated fire-resistance time only meet the requirements of fire-resistance integrity, fire-resistance integrity grade are 1.0h, 1.5h, 2.0h, 3.0h.British BS standard, there is a non - thermal fire door content.

Class b: closed stairwell door, stairwell front door, smoke proof stairway and fire fighting elevator Shared front door, fire fighting elevator Shared front door, directly open front door or Shared front door;

Class c: vertical shaft doors, such as strong electric Wells, weak electric Wells, pipe well doors, air conditioning room.


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