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GB 51251-2017 第3.3.7条 Technical Standard for Smoke Control and Exhaust Systems in Buildings

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GB 51251-2017 第3.3.7条

| **** | The mechanical pressurization air supply system shall use **ducts** for air supply and shall not use built-in civil air shafts. The air supply ducts shall be made of **non-combustible materials**, and the inner walls shall be smooth. |

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GB 51251-2017 第2.1.4条Technical Standard for Smoke Control and Exhaust Systems in…
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GB 51251-2017 第2.1.7条Technical Standard for Smoke Control and Exhaust Systems in…
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