Exhaust & Makeup Air Calculator
Work out restroom and kitchen-hood exhaust rates, and the makeup air needed to balance them, against IMC 403.3, 507.5 and 508.1.
Exhaust is the half of the calculation people remember. Makeup air is the half that fails inspection: pull air out of a tight building without replacing it and you get doors that will not open and hoods that will not capture.
Need the whole set drawn and stamped? Ask for a fixed quote, or see the other calculators.
Complete MEP permit set built to get approved.
Every mechanical, electrical, plumbing, and fire sheet your reviewer needs — a fixed quote in 24 business hours, first sets in as few as 5 working days, and city comments answered until your permit is issued.