防火排风排烟管、空调管、通风管等在使用过程中要承受一定时间的耐火,防火排风排烟管、通风管根据BS476-24进行耐火测试。
BS476-24: Fire test on building materials and structures-Part 24: Method for Determination of the fire resistance of ventilation ducts.
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防火排风排烟管、空调管、通风管等在使用过程中要承受一定时间的耐火,防火排风排烟管、通风管根据BS476-24进行耐火测试。
BS476-24: Fire test on building materials and structures-Part 24: Method for Determination of the fire resistance of ventilation ducts.
...