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 branddeure, 31 jaar se produksie ondervinding in branddeure en Vensters. Die belangrikste UL-branddeure, EN-branddeure, BS EN-branddeure, ens.. Ons het sertifisering. ZHTdeure ondersteun OEM en gratis ontwerp. Ons voordele: goeie gehalte, fabrieksprys, goeie diens. Welkom om ons te raadpleeg.