The size of the joint of the steel fireproof door is clearly specified: the big sister of the door leaf and the door frame shall not be less than 10mm, and the gap between the door leaf and the door frame shall not exceed 4mm. If the gap of the steel fire door is too large, it is difficult to ensure the sealing, and the fire door without sealing will lose the function of restraining fire and smoke spread.

Mga pultahan sa sunog sa ZHTdoors, 31 ka tuig nga kasinatian sa produksiyon sa mga pultahan sa sunog ug Windows. Ang nag-unang 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.