The materials of Grade B fire doors include wood, steel, steel wood, etc. Class B fireproof door requires that the fire resistance integrity of the door body must exceed 1h. 1.2mm thick electrolytic plate or galvanized sheet shall be used for the door frame, and 0.8mm thick electrolytic plate or galvanized sheet shall be used for the door leaf.

ZHTdoors milango ya moto, miaka 31 ya uzoefu wa uzalishaji katika milango ya moto na Windows. Milango kuu ya moto ya UL, milango ya moto ya EN, milango ya moto ya BS EN, nk., Tuna certification.ZHTdoors msaada OEM na bure design.Our faida: ubora mzuri, bei ya kiwanda, huduma nzuri.Karibu kushauriana nasi.