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I know it is an unusual design. It is for a very old subway station. There is no way to build ventilation shaft at this time. The only way I can think about is to run a very long duct.

No, it is not a homework. It is a subway station renovation project. The washroom is located in 20 metres below ground. The exhaust air duct starts from the washroom, through a few rooms at the same floor, then rises up 10 meters to the concourse level, the horizontal run of the duct in...

I would like find someone who could offer a suggestion in this forum.

Hi, here is the fan curve and data sheet. Thanks.http://files.engineering.com/getfile.aspx?folder=8099686f-e35b-4d49-a319-36115295dd69&file=GREENHECK_BSQ-80-5.pdf

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...