筛选通风风机防止空气中的尘粒吸入到机箱中。
Filtered ventilation fans prevent airborne dust particles from being drawn into the chassis.
为实现风机的兼用，提出通过划分防烟分区，使排烟风量与通风风量保持一致的方法。
Presents a method to make the smoke exhaust rate equal to the ventilation rate by smoke control zoning for the usage of the dual purpose fan.
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