filtration24/7 Emergency Service

Makeup Air Unit Service

Keep your booth at optimal temperature and pressure with

Function

Supplies fresh, filtered, and conditioned (heated or cooled) air to the paint booth to replace exhausted air

Location

Typically roof-mounted or adjacent to booth, connected via ductwork

Typical Lifespan

20-30 years with proper maintenance

Emergency Service Get Service Quote

Service Options

Repair Service

Replacement Service

Preventive Maintenance

24/7 Emergency Available

Signs of Makeup Air Unit (MAU) Failure

Booth not reaching temperature setpoint

Insufficient supply airflow

Unit making unusual noises

Excessive energy consumption

Inconsistent temperature control

Unit not starting on demand

Refrigerant leaks or cooling issues

What Causes Makeup Air Unit (MAU) Failure

Understanding the root cause helps determine whether repair or replacement is the best option.

Burner Problems

common

Gas burner issues (covered in burner component pages).

Filter Loading

common

Dirty filters restricting airflow through unit.

Fan/Motor Issues

occasional

Supply fan belt, bearing, or motor problems.

Control Problems

occasional

Temperature controller, damper actuators, or sensor failures.

Refrigeration Failure

occasional

DX cooling system issues (if equipped).

Repair vs. Replace Decision Guide

Repair When...

Individual components can be replaced
Burner can be serviced or replaced
Controls can be upgraded
Unit structure is sound

Replace When...

Unit is severely corroded
Major components obsolete
Capacity increase needed
Energy efficiency upgrade desired
Converting from direct-fired to indirect-fired

Cost Comparison

Component repairs $300-3,000. Burner replacement $5,000-15,000. Complete MAU replacement $25,000-100,000+ depending on size.

Lifespan Considerations

MAUs are major capital equipment. Proper maintenance extends life; premature replacement is expensive.

Brands Using This Component

We service makeup air unit (mau) across all major paint booth brands.

Modine

Direct-FiredIndirect-Fired

Aaon

Custom AHU

Trane

Commercial AHU

Carrier

Makeup Air

Reznor

Direct-Fired Heaters

Our Makeup Air Unit (MAU) Service Process

System Assessment

Evaluate overall MAU condition and performance.

Component Inspection

Inspect burner, fan, filters, dampers, and controls.

Performance Testing

Measure airflow, temperature rise, efficiency.

Perform Service

Replace filters, service burner, repair components.

Commissioning

Verify proper operation of all modes and safeties.

Makeup Air Unit (MAU) Service FAQ

Common questions about makeup air unit (mau) repair and replacement

A makeup air unit (MAU) supplies tempered fresh air to your paint booth to replace the air being exhausted. It typically includes filters, heating (and sometimes cooling), and a supply fan. The MAU maintains proper booth pressure and temperature for quality finishing.

Common causes include undersized burner, worn components reducing efficiency, dirty filters restricting airflow, damper problems, or control issues. Very cold outside temperatures can exceed design capacity. WERCS can diagnose and resolve heating issues.

Direct-fired units put combustion gases directly into the supply air (higher efficiency, some applications restricted). Indirect-fired units use a heat exchanger to separate combustion from supply air (required for some coatings and industries). Both types require regular service.

Have a question not answered here?

Call us at (877) 489-3727

Related Components

Burner Repair Supply Fan Filter Replacement Damper Actuator

Related Troubleshooting

Temperature Problems Booth Pressure Issues Not Heating

Need Makeup Air Unit (MAU) Service?

WERCS technicians have the expertise and parts to get your makeup air unit (mau) working properly. 24/7 emergency service available.

Call (877) 489-3727 Request Service Quote