防火门为何不合格？按《建筑设计防火规范》规定：甲级防火门，耐火极限应不低于１．２小时；乙级防火门，耐火极限应不低于０．９小时；丙级防火门，耐火极限应不低于０．６小时。防火门顾名思义得防火。其产品质量如何？全国统检结果令人吃惊，合格率仅６８％。目前全国... Why is the fire door unqualified? According to the “Code for Fire Protection in Building Design”: Class A fire doors, fire-resistance limit should not be less than 1.2 hours; Class B fire doors, fire-resistance limit should not be less than 0.9 hours; Class C fire doors, fire-resistance limit should not Less than 0.6 hours. Fire doors, as the name suggests, have fire protection. How is the product quality? The results of the nationwide inspection were astonishing and the passing rate was only 68%. The current national ...