Make-Up Air for Range Hoods Over 400 CFM

Last updated: October 26, 2026.

Short answer: If your kitchen hood is capable of more than 400 CFM, many homes need a make-up air solution under IRC M1503.6 (where adopted). Plan it with your HVAC/installer before ordering the hood—not after drywall is closed.

Start with the CFM calculator, then browse range hoods. Related: ventilation checklist.

Disclaimer: Estimates and code references are general information. Your local code official and licensed installer have the final say.

FAQ

What is make-up air for a range hood?

Make-up air is outdoor air brought into the home to replace air a powerful hood exhausts. Without it, high-CFM hoods can create negative pressure.

When is make-up air required?

IRC M1503.6 requires make-up air for kitchen exhaust hoods capable of more than 400 CFM in many jurisdictions that adopt that code. Local amendments vary.

Does a recirculating hood need make-up air?

Recirculating hoods do not exhaust outdoors, so they do not create the same make-up air demand—but they also do not remove combustion gases.