- 07
- Nov
UL Fireproof Door Rating
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.
Ọnụ ụzọ ọkụ ZHTdoors, afọ 31 nke mmepụta ihe na ọnụ ụzọ ọkụ na Windows. The isi UL ọkụ ọnụ ụzọ, EN ọkụ ọnụ ụzọ, BS EN ọkụ ọnụ ụzọ, wdg,..We nwere certification.ZHTdoors support OEM na free design.Our uru: Good quality, factory price, good service.Welcome to consult us.