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Building Systems $185+ diag

Make-Up Air Unit Service in Toronto, ON | Restaurant MUA, Commercial Kitchen Ventilation & Industrial MUA

Make-up air unit repair, maintenance and replacement for restaurants, commercial kitchens, industrial buildings and parking garages. We service Captive-Aire, Greenheck, Reznor and Modine, at $185 diagnostic, $650-$4,500 repair and $14K-$45K replacement. Ontario Building Code and NFPA 96 require make-up air for commercial kitchen exhaust.

MUA repair, maintenance and replacement for kitchens, industrial and parking garages.

  • Burner and gas train repair
  • Hood exhaust interlock checks
  • Airflow balancing
  • Winter no-heat priority
Call (437) 524-2997 Request Service View pricing
Technicians servicing a restaurant make-up air unit next to kitchen exhaust fans

Quick Facts

Pricing
$185+ diag
Emergency response
2-4 hours, 24/7
Labour warranty
90 days repair / 2 years install
Program lead
Priya Venkataraman, Service Coordinator

Commercial Credentials & Verification

TSSA G1 + G2

Licensed Gas Technicians

ESA

Electrical Safety Authority

313A Refrigeration

Licensed Refrigeration Mechanics

$5M CGL + WSIB

Enbridge-Authorized Since 2006

2-4 Hour Emergency Response 90-Day Labour Warranty on Repairs / 2-Year on Installs 5-Star Commercial Satisfaction 20+ Years Commercial-Only

Toronto Commercial HVAC repairs, maintains and replaces make-up air units for restaurants, commercial kitchens, food courts, industrial buildings and parking garages across Toronto and the GTA. We service Captive-Aire, Greenheck, Reznor and Modine units, both direct-fired and indirect-fired.

A make-up air unit replaces the air your exhaust removes. When it fails, the building goes negative. Doors slam or stick, hoods stop capturing smoke and grease, gas appliances can backdraft, and in winter the kitchen fills with cold air the moment the burner does not light. The usual culprits are ignition failures, weak flame sensors, gas valve faults, freeze-stat trips, failed blower bearings and broken exhaust interlocks.

MUA repairs typically cost $650 to $4,500, plus a $185 diagnostic waived on repairs over $750. Replacements run $14,000 to $45,000. Ontario Building Code and NFPA 96 require make-up air for commercial kitchen exhaust.

What Does Make-Up Air Unit Service Cover?

Burner and gas train

Ignition modules, flame safeguards, igniters, flame rods, gas valves, regulators and modulating valves. Every gas repair ends with a combustion check.

Air side

Blower motors, bearings, belts, filters, dampers and discharge temperature controls.

Interlocks and controls

Kitchen exhaust interlocks, freeze-stats, building pressure controls and BAS integration.

Balancing

Measured supply and exhaust airflow, adjusted so the building sits at the right pressure.

Direct-Fired vs Indirect-Fired MUA

FeatureDirect-firedIndirect-fired
How it heatsFlame in the airstreamHeat exchanger with flue
EfficiencyVery highLower
Common usesKitchens, warehousesParking garages, some occupied spaces
Typical replacement$14K-$35K$20K-$45K

Signs Your MUA Needs Service

  • Doors slamming or hard to open near the kitchen.
  • Smoke or cooking odours drifting into the dining room.
  • Cold air blowing into the kitchen in winter.
  • The unit trips on freeze-stat in the morning.
  • Squealing belts or grinding bearings on the roof.

Make-Up Air for Restaurants and Kitchens

Kitchen hoods run 3,000 to 10,000 CFM, and the MUA has to keep pace. For full kitchen programs, including walk-ins and dining room RTUs, see commercial HVAC for restaurants. For heating faults on other equipment, see commercial heating repair.

MUA Service Across Toronto and the GTA

We service make-up air in Entertainment District and King West kitchens, Woodbridge and Unionville restaurants, North York tower food courts, Hwy 410 industrial plants and condo-commercial parking garages. Our North York office tower MUA replacement restored building pressurization over one weekend for $38,000.

Transparent Pricing

How Much Does Make-Up Air Unit Service Cost in Toronto?

Diagnostic

$185

Burner, gas train, interlock, airflow and controls diagnosis.

  • Combustion test
  • Interlock check
  • Written findings
Book This
Most Requested

MUA Repair

$650-$4,500

Ignition, flame safeguard, gas valves, blowers, belts, freeze-stat, controls.

  • Winter no-heat priority
  • TSSA G1 technicians
  • 90-day labour warranty
Book This

MUA Replacement

$14K-$45K

Direct or indirect-fired replacement sized to measured exhaust.

  • Crane and permits
  • Interlock and balancing
  • 2-year labour warranty
Book This

Repairs start with a $185 diagnostic, waived on repairs over $750. Replacement pricing depends on airflow, burner type, crane needs and controls.

Why Us

Why Choose Toronto Commercial HVAC for Make-Up Air?

Kitchen Ventilation Know-How

We service the MUA, the exhaust interlock and the balance together, so the hood captures and the doors close properly.

Direct and Indirect-Fired

Direct-fired units for kitchens and warehouses, indirect-fired for parking garages and spaces that need flue separation.

Winter No-Heat Priority

An MUA that blows cold air into a kitchen in January gets priority routing on the dispatch board.

NFPA 96 and OBC Aware

We know how make-up air ties into kitchen exhaust requirements under NFPA 96 and the Ontario Building Code.

Brands We Stock For

Captive-Aire, Greenheck, Reznor and Modine ignition and control parts on the truck.

Measured Balancing

Supply and exhaust airflow measured with instruments, not guessed from the nameplate.

Repair or replace? Get the numbers first.

A $185 diagnostic gives you written findings per unit, waived when the approved repair is over $750.

(437) 524-2997 Request Service

Process

How Does Our Make-Up Air Process Work?

  1. 01

    Call Dispatch

    Kitchens without make-up air in winter get priority. Emergencies get a 2-4 hour response.

  2. 02

    Diagnose

    Ignition, flame signal, gas pressure, freeze-stat, blower, belts, interlocks and airflow checked.

  3. 03

    Quote

    Written findings and a fixed repair price, or a replacement quote sized to measured exhaust airflow.

  4. 04

    Repair or Replace

    Licensed G1 crews do the work. Priya Venkataraman, Service Coordinator, schedules around service hours and closed days.

  5. 05

    Balance and Verify

    Supply balanced against exhaust, interlocks tested and a combustion report left for your file.

Field Photos

Make-Up Air Work on Toronto Commercial Sites

Track Record

Related Commercial Projects

All projects

Client Feedback

What Clients Say About Our Make-Up Air

5-Star Commercial Satisfaction

"The kitchen was freezing every morning and the hood was not pulling smoke. They fixed the burner and balanced the air the same day."

Antonio Greco

Owner, Pizzeria with wood-fired oven

North York

MUA flame safeguard and gas valve replacement$2,750

"Seven kitchens on one system and the lobby was always negative. After their balancing work, the doors close normally and tenant complaints stopped."

Kim Nguyen

Operations Manager, Food court in a commercial office tower

Downtown Toronto

Exhaust interlock repair and supply rebalance across 7 tenants$6,900

"The garage MUA had been off for weeks under the previous contractor. They had it running in two visits with a full combustion report."

Bruce Adair

Property Manager, Condo-commercial underground parking garage

Etobicoke

Indirect-fired MUA burner and blower motor repair$4,300

Straight Answers

Make-Up Air FAQs

How much does make-up air unit service cost in Toronto?

Make-up air unit repairs in Toronto typically cost $650 to $4,500, plus a $185 diagnostic that is waived on repairs over $750. Ignition modules, flame safeguards, gas valves, freeze-stats, belts and blower bearings sit at the lower end. Blower motors, burner sections and control boards sit higher. A full make-up air unit replacement runs $14,000 to $45,000 depending on airflow, direct or indirect firing, crane access and controls. We size replacements from measured exhaust airflow rather than the old nameplate, because many kitchens have changed hoods or cooking equipment since the original unit went in.

Why do our restaurant doors slam or stick open?

That is a pressure problem. When kitchen exhaust pulls more air out than the make-up air unit brings in, the building goes negative and doors are hard to open or slam shut. It can also cause poor hood capture, smoke in the dining room and backdrafting of gas appliances. We repair the MUA and balance supply against exhaust.

What is the difference between direct-fired and indirect-fired MUA?

Direct-fired units burn gas directly in the airstream, which is very efficient and common in kitchens and warehouses. Indirect-fired units use a heat exchanger and flue, keeping combustion products out of the supply air, and are often used for parking garages and occupied spaces where that separation is required.

Is make-up air required for commercial kitchens?

Yes. Kitchen exhaust hoods need make-up air to replace the air they remove. The Ontario Building Code and NFPA 96 set the framework, and local inspectors check it during permits and inspections.

Why does our MUA trip in the morning?

Often an ignition failure that leads to a freeze-stat trip, since the unit blows cold outside air when the burner does not light. Weak flame sensors, dirty burners and gas pressure issues are common causes.

How often should a make-up air unit be serviced?

At least twice a year: a fall heating start-up with combustion check and a spring check of belts, bearings and airflow. Busy kitchens benefit from quarterly visits.

Do you check kitchen exhaust interlocks?

Yes. The interlock makes sure the MUA runs when the hood exhaust runs. We test it on every visit.

Do you clean kitchen exhaust ducts?

No. Grease duct cleaning is a separate specialty trade. We service the make-up air unit, exhaust fan motors and interlocks, and coordinate with your hood cleaning contractor.

Can you replace an MUA without closing the restaurant?

Most replacements happen on a closed day or overnight, including the crane lift, so you do not lose a service.

Is there a warranty?

Repairs carry a 90-day labour warranty and replacements a 2-year labour warranty.

Keep Exploring

24-Hour Commercial Emergency Dispatch

Ready to Book Make-Up Air?

Make-Up Air Unit Service across Toronto and the GTA: $185+ diag, written findings before any work, and a 2-4 hour emergency response.

Call (437) 524-2997 Request Service
  • TSSA G1+G2, ESA, 313A
  • Written findings every visit
  • 90-day / 2-year labour warranty
Call (437) 524-2997Request Dispatch