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  1. baecs

    exhaust fan sizing for long duct

    Hi, I am sizing an exhaust fan for a washroom located 20 meters below ground in a subway station. The horizontal run of the exhaust ducg is 80 meters, plus 8 elbows. The duct ends up at the exterior wall above ground. The exhaust air is 300CFM. My calculation shows me the pressure drop of the...

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