In the examples used above, if your kitchen has a 30-- stove (
250 CFM minimum) in a 16' x 16' x 8' room (
512 CFM minimum), and a 40,000 BTU gas stove (
400 CFM minimum) you would want a fan rated at
512 CFM or higher, plus
100 CFM for the ductwork for a total of
612 CFM or more.
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