GB 51251-2017 第3.3.5条
| **** | Mechanical pressurization supply fans should use **axial fans** or **medium-low pressure centrifugal fans**, and their installation should comply with the following requirements:<br>1. The air intake of the supply fan should be directly open to the outdoors;<br>2. The air intake of the supply fan and the air outlet of the smoke exhaust fan should be **installed separately**, and the horizontal distance between their edges should not be less than **20.0m**; when the horizontal distance is insufficient, the air intake should be lower than the air outlet, and the vertical distance should not be less than **6.0m**. |