Do I need make‑up air for a 900 CFM range hood in a tight home?
1 Like
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.
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.