The fire resistance time of Class C fire door shall not be less than 0.5 h. Accessories used for Class C fire doors must be treated for fire protection to meet the specified fire resistance limit.

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.