The fire resistance time of Class A fireproof door is up to 1.5 hours. The internal horizontal and vertical frames of the door leaf are reinforced, effectively preventing the door leaf from being deformed by heat. The interior of the fire door leaf is filled with dense fire-retardant cloth faced perlite fire-proof board, and all parts are filled fully.

ZHTdoors yong’inga qarshi eshiklar, yong’in eshiklari va derazalarida 31 yillik ishlab chiqarish tajribasi. Asosiy UL yong’in eshiklari, EN yong’in eshiklari, BS EN yong’in eshiklari va boshqalar.