UL fireproof doors have been proved to be fireproof tested by the door components in the fire test conducted according to the standards, to ensure their fire performance characteristics as fireproof doors. American standard fire door, wh certificate based on ul standard, with 20-180 minute fire certificate.

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.