The steel wood fireproof door is made of steel and fireproof wood products. The filling in the door frame and door leaf is a non-toxic and harmless fire insulation material for human body. The fire limit of this fire door is above 1.2H.

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.