Normally closed fire doors are closed at ordinary times and need to be pushed open when someone walks around. The normally closed fire door does not need to be set with electric automatic control, so the cost is low; The normally closed state can isolate and protect some important equipment and facilities.

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.