Assertion: hood | /r/CapableOf | exhaust less than 400 cfm
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text: That said, Tom Wheeler notes that range hoods that exhaust less than 400 cfm do not require makeup air, and Dave’s own research suggests that even in a tight house—one with an air leakage rate of 1.5 ach50 or less—no makeup air should be needed for a vent hood with a capacity of 250 cfm.