Fire doors are classified into the following three types: Class A, Class B and Class C. The fire resistance time of Class A fire door shall not be less than 1.5 hours; The fire resistance time of Class B fire door shall not be less than 1.0 hour; The fire resistance time of Class C fire door shall not be less than 0.5 h.

ZHTdoors fire doors, 31 taong karanasan sa produksyon sa fire door at Windows. Ang pangunahing UL fire doors, EN fire doors, BS EN fire doors, atbp.,.Kami ay may certification.ZHTdoors support OEM at libreng disenyo.Our advantages:good quality, factory price, good service.Welcome to consult us.