The fire door is highly airtight, and it is impossible to leave a gap to make the air conditioner and radiator flow out as long as it is closed in time. After the fire door is installed and closed, the gap shall not be too large, otherwise the sealing performance of the fire door cannot be guaranteed, and its function of restraining fire and smoke spread cannot be reflected under fire conditions.

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.