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Old 11-18-2013
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Re: Replacing my "engine room" blower?

If you really want to know the actual CFMs, contact an HVAC company. They can measure using a Volumeter made for balancing systems.

You should be exhausting from down low and makeup air should come in high.

Here is an explanation of fan performance... ftp://www.nyb.com/Letters/EL-03.pdf

As far as what should the CFM be... if your engine compartment is 10 cubic feet and you are able to move 10 CFM, you would exchange all the air in that compartment in 1 minute. Running that fan for 5 minutes would exchange that air 5 times.
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1969 Bristol 32 Keel/CB Hull 26
Narragansett Bay RI USA
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