Class A fireproof doors are especially suitable for those occasions that require fine grinding before electroplating, excellent vibration, mirror polishing of hand tools, mirror polishing of electric heating tubes, etc. Although in terms of purchase cost, Class A fireproof doors are higher than Class B fireproof doors, but in terms of comprehensive use cost, Class A fireproof doors are better than Class B fireproof doors in many aspects.

ZHTdoors branddörrar, 31 års produktionserfarenhet inom branddörrar och fönster. De viktigaste UL branddörrarna, EN branddörrar, BS EN branddörrar, etc.,.Vi har certifiering.ZHTdörrar stödjer OEM och gratis design.Våra fördelar:god kvalitet, fabrikspris, bra service.Välkommen att rådfråga oss.