Can I use a 4 inch duct for a range hood?

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Yes, but duct size depends on the CFM of your range hood. Four-inch duct is too small for most range hoods. It is only appropriate for hoods that are rated 400 CFM or under. We recommend a minimum duct size of 6” for 600 CFM hoods, 8” for 900 CFM hoods, and 10” for 1200 CFM range hoods.

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