The fire prevention time of fire doors is mainly determined by fire boards. In this regard, the performance of fire boards used for Class A fire doors is generally better than that of fire boards used for Class B fire doors, so the overall performance is better than that of Class B fire doors.

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.