GB 51251-2017 第9.5.1条
- **** | Smoke exhaust ducts shall be made of non-combustible materials with smooth inner walls. In hotel buildings, smoke exhaust ducts (such as galvanized steel sheet ducts) must meet this requirement.
- **** | Smoke exhaust ducts shall be made of non-combustible materials with smooth inner walls. In hotel buildings, smoke exhaust ducts (such as galvanized steel sheet ducts) must meet this requirement.
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