Uploaded August 2026 | Updated September 2026, 2 weeks ago
When it comes to kitchen hood fans, more properly known as a ducted kitchen range hood, bigger is better. At least that's what most people think. I won't discuss this here, but you can listen to me and Tessa discuss it on our podcast: youtu.be/-Tsv9suvZwc
Outside of Minnesota, you can use section M1503.6 of the IRC, and it'll basically tell you to provide makeup air anytime you're installing a fan over 400 CFMs.
But for Minnesota, we have some complicated formulas that we simplified to get right to the answer: docs.google.com/spreadsheets/d/1VT9XTGvmk7RVMfh4D-_iveF8LyNhYBelOeqSKS6vPds/edit?usp=sharing
And if you want to calculate the size of a required makeup air duct, use this one: docs.google.com/spreadsheets/d/1b_899bkGIt8WNK8H6KwrErB9_YO80jAYb2zVy5dIEDk/edit?usp=sharing
When it comes to kitchen hood fans, more properly known as a ducted kitchen range hood, bigger is better. At least that's what most people think. I won't discuss this here, but you can listen to me and Tessa discuss it on our podcast: youtu.be/-Tsv9suvZwc
Outside of Minnesota, you can use section M1503.6 of the IRC, and it'll basically tell you to provide makeup air anytime you're installing a fan over 400 CFMs.
But for Minnesota, we have some complicated formulas that we simplified to get right to the answer: docs.google.com/spreadsheets/d/1VT9XTGvmk7RVMfh4D-_iveF8LyNhYBelOeqSKS6vPds/edit?usp=sharing
And if you want to calculate the size of a required makeup air duct, use this one: docs.google.com/spreadsheets/d/1b_899bkGIt8WNK8H6KwrErB9_YO80jAYb2zVy5dIEDk/edit?usp=sharing
