# Do I need make‑up air for a 900 CFM range hood in a tight home? **URL:** \ **Category:** Trade Talk\ **Created:** [August 4, 2025, 3:27pm UTC](https://home.renovation.reviews/t/do-i-need-make-up-air-for-a-900-cfm-range-hood-in-a-tight-home/20074 "2025-08-04T15:27:05Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![reno\_questions](https://home.renovation.reviews/user_avatar/home.renovation.reviews/reno_questions/32/2758_2.png) [@reno\_questions](https://home.renovation.reviews/u/reno_questions)\ **Post date:** [August 4, 2025, 3:27pm UTC](https://home.renovation.reviews/t/do-i-need-make-up-air-for-a-900-cfm-range-hood-in-a-tight-home/20074/1 "2025-08-04T15:27:05Z")
Do I need make‑up air for a 900 CFM range hood in a tight home? ---
**Author:** ![Tim\_Michael1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_michael1/32/6294_2.png) [@Tim\_Michael1](https://home.renovation.reviews/u/Tim_Michael1)\ **Post date:** [August 11, 2025, 6:46pm UTC](https://home.renovation.reviews/t/do-i-need-make-up-air-for-a-900-cfm-range-hood-in-a-tight-home/20074/2 "2025-08-11T18:46:03Z")
Yep, if your place is sealed up tight, a 900 CFM range hood will probably need make-up air. If you don’t have it, the hood can suck so hard it makes doors tough to open, drags in nasty stuff from outside, and might even mess with your gas appliances. A lot of building codes say you need a make-up air system for hoods that move over 400 CFM anyway, so you’re likely going to need a vent that pulls in fresh air when the hood is running. ---
**Author:** ![Tim\_curtis](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_curtis/32/2766_2.png) [@Tim\_curtis](https://home.renovation.reviews/u/Tim_curtis)\ **Post date:** [August 11, 2025, 8:12pm UTC](https://home.renovation.reviews/t/do-i-need-make-up-air-for-a-900-cfm-range-hood-in-a-tight-home/20074/3 "2025-08-11T20:12:45Z")
Yes 900 CFM in a tight home can cause pressure imbalances and backdrafting, so a dedicated make-up air system is typically required by code.