Calculate cfm of an exhaust fan

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Old 03-11-09, 02:54 AM
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Calculate cfm of an exhaust fan

Hi Everyone,

Am creating a simulator application for HVAC. I also need to calculate the CFM of exhaust fan. Is there any generalized formula to calculate the approximate air flow rate of exhaust fan given motor & fan specifications. If anyone know, please do tell me. It'll be a great help for my application. Thanks in advance...
 
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Old 03-11-09, 06:25 AM
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Hi Vin, there are general approximations, but I know of no list for mfg, or specified motors to relate to exhaust volume. In the energy auditing business we have a special hood to place over the exhaust fan (when it fits) to measure the depressurization. From that we can estimate the cfm rating. How accurate do you need to be?

Bud
 
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