In addition to the functions of ordinary doors, fire doors also have special functions of fire prevention, smoke separation, fire suppression and evacuation protection. The fire door can only meet the requirements of fire integrity within the specified fire resistance time, and the fire integrity levels are 1.0h, 1.5h, 2.0h and 3.0h respectively.

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.