TL;DR
A makeup air unit is a powered ventilation appliance that draws in outdoor air, filters it, and usually tempers it with a heater or coil before delivering it to replace large exhaust volumes. In homes it pairs with high-output range hoods over about 400 cfm; in restaurants and shops it balances hood exhaust so doors do not whistle and pilots do not blow out.
What it means
A makeup air unit is a powered ventilation appliance that draws in outdoor air, filters it, and usually tempers it with a heater or coil before delivering it to replace large exhaust volumes. In homes it pairs with high-output range hoods over about 400 cfm; in restaurants and shops it balances hood exhaust so doors do not whistle and pilots do not blow out. Quotes should state its airflow, heating type, and how it interlocks with the exhaust it serves.
Where it sits in the glossary
Makeup air unit is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.