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Outdoor Air Rate Determination

Outdoor Air Rate Determination

Hi Folks,

I have a Supply Fan Delivering 22,500 CFM of Supply Air. A Return Fan bringing back: 20,200 CFM. And a washroom exhaust fan in the space exhausting 1000 CFM.
To Summarize:
SA: 22,500 CFM
RA: 20,200 CFM
Washroom Exhaust: 1000 CFM

What is my Outdoor Air rate?

RE: Outdoor Air Rate Determination

Written just like a homework problem. Simple conservation of mass equation will yield the answer.

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