One, Standard thickness of steel fireproof door
1、According to national standards, fire doors are required to have a fire resistance time of 1.5 hours (Class A), 1.0 hour (Class B), and 0.5 hour (Class C). The minimum material requirements are: frame board thickness of 1.2mm, door leaf thickness of 0.8mm. These dimensions can also be exceeded based on customer requirements.
2、Steel fire-resistant doors, with door leaf thicknesses of: Class A – 50mm, Class B – 46mm, Class C – 40mm.
3、Steel fire-resistant doors: the thickness of the side walls of the door frame are as follows: Class A: 100mm, Class B: 88mm, Class C: 67mm.
4、The filling material for steel fire-resistant door leaves consists of perlite, with filling thicknesses of 48mm for Class A, 43mm for Class B, and 39mm for Class C.
Two. Standard dimensions for steel fire doors
1、Steel fire-resistant door main structure requirements
The door leaf surface and door frame must be made of cold-rolled steel sheets that meet national standards. Due to variations in brand and fire resistance requirements, the thickness of the door frame and door leaf surface may vary. The standard door frame should be at least 1.5mm thick, while the door leaf surface should be at least 1mm thick. Reinforcement components should also be at least 1.5mm thick, and the filling material must be fire-resistant and non-combustible.
2、Requirements for steel fire-resistant door accessories
The hinges, as a necessary component, must have fire resistance and heat resistance, with a metal melting point temperature of at least 950 degrees Celsius. Hinges should not use double-sided springs. If using a single-sided fire door, a closer should be installed.
3、Requirements for steel fire-resistant door components
Metal component welding requires specific standards, ensuring that all components are securely fastened and that welds are uniformly distributed. If burns or false welds occur during construction, the affected areas must be re-welded or discarded. The finished product's exterior must not have any visible welds. The process should be used to smooth and conceal the welds.
4、Surface treatment requirements
The finished fire-resistant door should be primed after installation, and the surface should be smooth and even after completion. Any defects such as pinholes, bubbles, and unevenness should be considered as non-conforming and require rework.
5、Door frame and door leaf joint requirements
Fire-resistant doors are a special type of building material with strict specifications and standards. During acceptance, the gap between the door leaf and the door frame must not exceed 10mm when the door is closed. If it is a double-leaf fire-resistant door, the gap between the two leaves must not exceed 4mm.