The surface of the fire door should be smooth and clean, without obvious dents or mechanical damage. The welding of the steel fire door should be firm, the solder joints should be evenly distributed, and there should be no false welding, burn-through, leakage of welding, etc.

https://ztfiredoor.com/19764.html

steel fire insulate door,weather proofelectromagnetic fire door holder,steel fire door,water and fire proof doors,steel solid casting fire proof door lever handle,fire rated single elaf door,steel fire insulate door,fire resistant decorate door,steel solid casting fire proof door lever handle,steel door fire doors,steel fire door,steel fire resistance door,steel fire insulate door,steel door fire rated,steel fire door,steel solid casting fire proof door lever handle