In many fire doors, fire doors also have unusual advantages. The steel fireproof door leaf can be divided into three specifications according to its thickness. The higher the specification, the better the sound insulation and noise reduction of the fireproof door, as well as the actual effect of thermal insulation.

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.