The fire resistance of steel fire doors is different. The fire resistance can be divided into three grades: A, B and C. Steel fire doors of different grades can be used in various places. The advantages of steel fire doors make them occupy a large market share in public buildings. It is widely used in hospitals, schools and shopping malls.

ZHTdoors fire doors, 31 years of production experience in fire doors and Windows. The main UL fire doors, EN fire doors,  BS EN fire doors, etc.,.We have certification.ZHTdoors support OEM and free design.Our advantages:good quality, factory price, good service.Welcome to consult us.