Technical Standards for Steel Fire Doors
I. Material and Fire Resistance Requirements
Fire Resistance Ratings:
Class A Fire Doors: The fire resistance rating must be no less than 1.2 hours.
Class B Fire Doors: The fire resistance rating must not be less than 0.9 hours.
Class C Fire Doors: The fire resistance rating must be no less than 0.6 hours.
II. Door Leaf Opening Directions
Right-Hand Opening: The door rotates clockwise.
Left-Hand Opening: The door rotates counterclockwise.
Evacuation Direction: The opening direction of the fire door must align with the evacuation route.
III. Technical Requirements
Materials and Accessories
Door Frame and Leaf: The frame and face panel should be made of cold-rolled thin steel plates. The frame must be constructed from 1.5 mm thick steel, while the leaf should utilize 1.2 mm thick steel. Reinforcements should preferably use 1.5 mm thick steel, and if screw holes are present, the steel thickness must not be less than 3.0 mm.
Filling Material: The door leaf and frame should be filled with non-combustible materials.
Hardware Accessories: Locks, hinges, and bolts installed on the steel fire door must have a melting temperature of no less than 950°C.
Hinge Requirements: No double-action springs are allowed on the hinges. Single-leaf doors should be equipped with a door closer.
Double-leaf Door Requirements: A cover plate must be installed between the leaves, along with a door closer and positioning device.
Sealing Grooves: The door frame must have a sealing groove filled with non-combustible sealing strips.
IV. Appearance Quality
Welding Requirements: Welding should be strong and uniformly distributed. There should be no false welding or burn-throughs. The weld areas must be smoothed and free from defects.
Surface Coating Requirements: The surface of the fire door should be coated with an anti-rust primer, ensuring an even, smooth, and uniform paint layer. There should be no paint accumulation, pitting, bubbling, missed spots, or drips.
Fire resistance steel door
Fire Door Fitting Requirements When in the closed position, the door leaf must fit snugly against the door frame. The following fitting standards must be adhered to: Overlap Measurement: The overlap between the door leaf and the frame should not be less than 10 mm. This measurement should be taken at the midpoint on both sides of the door leaf and at the top center, with the reading recorded to the nearest 1 mm. Side Gap Requirements: The gap between the door leaf and the door frame on both sides must not exceed 4 mm. Top Gap Requirements: The gap at the top of the door leaf must not exceed 3 mm. Double Leaf Door Gap: For double leaf doors, the gap in the center must not exceed 4 mm. Measurements should be taken at the midpoint on the sides or top of the door leaf, with readings accurate to 1 mm.