Components Of Fire-rated Doors

Door Frame, Door Leaf, and Door Leaf Filling
The door leaves and frames of commonly used wooden and steel fire doors are made of fire-retardant wood and steel, respectively. If the door leaf contains filling material, it should be filled with fire-resistant and heat-insulating materials that are non-toxic and harmless to the human body.

 

The wood used in wooden fire doors should be treated with fire retardant and meet the requirements of GB/T8625-2005.

 

The door frame and door leaf of steel fire doors are made by stamping and assembling galvanized steel plates. The thickness of the steel plate for the door frame should be greater than 1.2mm, and the door leaf should be greater than 0.8mm. The physical and chemical properties of the steel plate must meet the corresponding standards for cold-rolled and hot-rolled steel plates.

 

 

Filling materials can include aluminum silicate cotton, rock wool, or perlite fireproof board. Due to dust pollution, rock wool and aluminum silicate cotton will be gradually phased out with the implementation of new standards.

 

Fire-rated Locks (Panic Bars)

Fire doors should be equipped with fire-rated locks, which should be tested and certified by a nationally recognized and authorized testing institution.

 

In places with high traffic density, such as shopping malls and supermarkets, fire doors need to be equipped with panic bars to allow people to quickly escape by pushing the bar to open the fire door in case of a fire.

 

Pipe shaft access doors are locked and closed with special fire-rated locks.

 

Intumescent Seals

Intumescent seals are installed in the grooves around the door frame and door leaf. Their function is to expand rapidly when heated during a fire, sealing the gaps in the door to prevent smoke from passing through.

 

Door Closer

Fire doors should be equipped with fire-rated door closers, or a closing device that automatically closes the door leaf in case of fire (except for special locations, such as pipe shaft doors).

 

Door Coordinator

One leaf of a double-leaf fire door will have a steel cover plate. If the two leaves close in the wrong order, the fire door will not close properly. Therefore, a door coordinator is required for double-leaf fire doors to ensure that both doors close in the correct sequence.

 

Electromagnetic Door Holders

For normally open fire doors (in areas with frequent traffic), electromagnetic door holders should be installed. Under normal circumstances, the electromagnetic door holder holds the door leaf open. The door holder is connected to the fire alarm system; in case of fire, the door holder releases, and the door closes automatically due to the action of the door closer.

 

Fire-Resistant Glass

If glass is incorporated into a fire door, fire-resistant glass should be used, and its fire resistance performance should meet the requirements of the corresponding fire door category.