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Here are the known's of a chassis:

Inlet open area = 17 inches^2

Outlet open area = 30 inches^2

Internal Fans = 270 cfm (3 fans @ 90 cfm each)

What is the CFM through the system and what's the equations used to figure this out?

I assume that if we had a very small inlet or outlet open area the pressure will build and decrease the CFM. I want to know if my fans will be choked or if they will run at 270cfm.

Thanks a ton!

John

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# CFM calculation with a known fan and different inlet and outlet areas

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