GB 50243-2016 第6.2.4条
| **** | When an air duct passes through a fire-rated or explosion-proof wall or floor slab that requires enclosure, an embedded pipe or protective sleeve shall be provided, with a steel plate thickness of not less than 1.6 mm; the gap between the air duct and the protective sleeve shall be sealed with non-combustible flexible material. **(Hotels have many fire compartments; this is a mandatory provision to ensure the effectiveness of fire separation)** |