Checklists by Category
Makeup air unit (MAU) maintenance checklists
Makeup air unit (MAU) maintenance checklists for the quarterly and annual rounds: 2 free lists, 29 items and 21 photo requirements, each item naming what to look for and the photo evidence it needs. Work is commonly verified against IMC (mechanical code); the edition in force is the AHJ's call on each project.
The makeup air unit (MAU) rounds
Where each walk sits in the schedule
01quarterly
Makeup air unit (MAU) quarterly maintenance checklist
Every quarter, run on the same visit as the kitchen exhaust fan so the supply-and-exhaust pair is checked together, not separately.
Run by: The HVAC or kitchen-exhaust service tech on the quarterly rooftop round.
02annual
Makeup air unit (MAU) annual maintenance checklist
Once a year, before the heating season, so the burner is proven and the tempered-air delivery is set before cold outdoor air reaches the kitchen.
Run by: The HVAC service lead, ideally with the kitchen exhaust balanced on the same visit.
What most often fails on a makeup air unit (MAU)
- Filters loaded solid with cooking grease and street dust, so the unit can't deliver the air the hood is pulling and the kitchen goes negative.
- Interlock never actually watched: the tech assumes the MAU starts with the hood instead of standing at the unit while the exhaust fan is switched on.
- Outside-air damper stuck part-closed on a seized linkage and logged as 'operating' because nobody watched the blades move.
- Direct-fired burner sooting or running a lazy flame from drifted gas pressure, tempering the air unevenly and carrying combustion products into the supply stream.
- Supply airflow never measured against what the hoods exhaust, so the building stays slightly negative and back doors won't latch.
- Fan bearings run to failure because they were greased on the quarterly but never listened to or checked for play on a deep pass.
Verified against
Families only, never clause numbers. Adoption varies by jurisdiction; confirm the edition your authority having jurisdiction enforces before you run a walk against it.
Common questions
5 answers
- Which makeup air unit (MAU) maintenance rounds do these checklists cover?
- Makeup air unit (MAU) quarterly maintenance checklist (quarterly): Every quarter, run on the same visit as the kitchen exhaust fan so the supply-and-exhaust pair is checked together, not separately. Makeup air unit (MAU) annual maintenance checklist (annual): Once a year, before the heating season, so the burner is proven and the tempered-air delivery is set before cold outdoor air reaches the kitchen.
- Who runs the makeup air unit (MAU) maintenance round?
- The HVAC or kitchen-exhaust service tech on the quarterly rooftop round. The HVAC service lead, ideally with the kitchen exhaust balanced on the same visit.
- What most often fails on a makeup air unit (MAU)?
- Filters loaded solid with cooking grease and street dust, so the unit can't deliver the air the hood is pulling and the kitchen goes negative. Interlock never actually watched: the tech assumes the MAU starts with the hood instead of standing at the unit while the exhaust fan is switched on. Outside-air damper stuck part-closed on a seized linkage and logged as 'operating' because nobody watched the blades move. Direct-fired burner sooting or running a lazy flame from drifted gas pressure, tempering the air unevenly and carrying combustion products into the supply stream.
- Which standards is makeup air unit (MAU) work verified against?
- IMC (mechanical code), published by the International Code Council. Adoption varies by jurisdiction. Confirm the edition your authority having jurisdiction enforces before you run a walk against it.
- Can I run these checklists in RTI?
- Yes. Start a free RTI workspace and load any of the 2 lists (29 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper evident audit trail.
Run these lists with the Photo Gate.
Tag one area, scan it, and the submit stays locked until the photos exist.
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