Steel fire doors have high strength and good fire resistance. The fire-resistant material filled inside the steel fire-resistant door and leaf is environmentally friendly and pollution-free. The surface treatment process of the door leaf is powder spraying or PVC coating, which are mature environmental protection processes.

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.