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Duct size for 800 cfm blower

Patrick Green
last month

Hello All,

We have a Wolf range hood (362418) which has a 10" exhaust on the top, and we have a 800cfm blower. Our old range hood had an 8" exhaust, which was reduced to 7" duct work that vented to the outside. The duct work is probably 15 feet long.


Can we reduce the 10" to 7" or do we need to redo the duct work to be at 10", or maybe 9 or 8". The hood can use up to a 1200cfm blower, which I believe is why they use a 10" exhaust. Maybe the 800cfm needs this size as well, but I'm not sure


Thanks in advance for your help

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