UL fire door standard is to conduct fire resistance test and subsequent water impact test for fire doors within a specified time (60min/90min). Generally, UL labels on products need to be applied for certification, and UL fireproof door labels can be affixed on products only after they meet the certification requirements.

ZHTdoors pòt dife, 31 ane eksperyans nan pwodiksyon nan pòt dife ak fenèt yo. Pwensipal UL dife pòt yo, EN dife pòt yo, BS EN dife pòt yo, elatriye,.Nou gen certification.ZHTdoors sipòte OEM ak konsepsyon gratis.Avantaj nou yo: bon kalite, pri faktori, bon sèvis.Byenveni pou konsilte nou.