When selecting steel fire doors, the core principle should be based on the requirements of building fire protection design, with priority given to fire resistance rating, material thickness, and hardware accessory quality, to ensure that the product meets relevant national standards. In terms of material, the thickness of the steel plate for Class A fireproof door leaf should not be less than 1.2mm, Class B should not be less than 1.0mm, and Class C should not be less than 0.8mm. The thickness of the door frame should match the specifications of the door leaf to ensure the stability of the overall structure. The internal core material should be selected from fire-resistant materials that comply with national standards, are environmentally friendly and non-toxic, and resolutely avoid using inferior core materials to prevent affecting the fire prevention effect and leaving safety hazards.

Hardware accessories are a key component of steel fireproof doors, and accessories such as fireproof hinges, fireproof locks, and door closers must have high temperature resistance. The hinge bearings are mostly made of brass material, and the lock core can withstand high temperatures above 950 ℃, ensuring that the door can be opened and closed normally in the event of a fire. During installation, the door frame should be firmly connected to the wall, and the gaps should be filled with fireproof sealant to prevent smoke from leaking through the gaps. Daily maintenance is equally important. It is necessary to regularly check the flexibility of door closers, hinges, and other accessories, and promptly clean the dust and debris on the surface of the door to avoid deformation caused by hard object impact.

A comprehensive maintenance should be conducted every six months to check whether the fireproof sealing strip is intact and whether the hardware accessories are faulty. Damaged parts should be replaced in a timely manner to ensure that the steel fireproof door is always in good working condition and to strengthen the building's fire safety defense line.