The fire resistance time of Class B steel fire door shall not be less than 1.0 hour, and the hardware fittings used on the fire door must also be fire-resistant hardware fittings. The steel fire door only needs to be pushed open by hand, and then it will be closed quietly and automatically, without the noise of knocking like opening the door inside and outside, and then create a quiet environment.

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.