UL steel fire doors have fire ratings from 20 minutes to 3 hours. UL Fire Door When a fire occurs, the fire door can prevent the spread of smoke and can effectively block the spread of the fire.

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.