The steel fireproof door is relatively heavy, and has high requirements for door jambs and hinges. The steel fire door is impact resistant, and the structural strength can withstand long-term collision without reducing fire protection, and can withstand the impact of fire hydrant.

Deriyên agir ZHTdoors, 31 sal ezmûna hilberînê di deriyê agir û pencereyan de. Deriyên agir ên sereke yên UL, deriyên agir EN, deriyên agir BS EN, hwd.. Em xwedî sertîfîkayê ne.