Tempered Makeup Air Units: Explained

The Importance of Tempered or Heated Makeup Air Units

In a busy commercial kitchen, airflow isn’t just about comfort; it’s critical to performance, safety, and staying up to code. As your exhaust hood pulls out heat, smoke, and grease-laden air, that air has to be replaced to keep your space balanced. That’s where a makeup air unit comes in.

And in colder climates, bringing in untreated outdoor air can create just as many problems as it solves. That’s why tempered or heated makeup air units play such an important role in modern kitchen ventilation systems.

Here’s what you need to know, straight from the experts at HoodMart.

What Is a Makeup Air Unit and Why Does It Matter?

A makeup air unit is a critical part of any commercial kitchen ventilation system. Its job is simple: replace the air being exhausted by your hood with fresh, clean air from outside.

But here’s where it gets important: without proper makeup air, your kitchen can quickly run into serious issues, including:

• Negative air pressure, making doors hard to open and close
• Poor ventilation performance
• Temperature imbalances
• Smoke and grease lingering in the air

In short, if your exhaust system pulls air out, your make up air unit puts it back, keeping your kitchen balanced, safe, and comfortable.

Why Heated Makeup Air Units Are Essential in Cold Climates

In colder regions, pulling in outside air creates a new challenge: that air is freezing. A heated makeup air unit, also known as air tempering, solves this problem by warming incoming air before it enters your space.

This ensures:

• Consistent indoor temperatures
• Comfortable working conditions for staff
• Better overall HVAC performance

Without air tempering, your kitchen may struggle to maintain temperature, leading to higher energy costs and an uncomfortable environment.

Key Benefits of Tempered Makeup Air Units

A properly designed makeup air unit system does more than just replace air, it improves your entire operation.

1. Better HVAC Efficiency

• Pre-heats incoming air before it reaches your HVAC system
• Reduces strain on heating equipment
• Helps maintain stable indoor temperatures

2. Lower Energy Costs

• Improves energy efficiency during cold weather
• Reduces overall heating demand
• Helps control long-term operating costs

3. Balanced Air Pressure

• Eliminates negative pressure issues
• Makes doors easier to open and close
• Prevents drafts and uneven airflow

4. Improved Safety

• Reduces the risk of dangerous backdrafts
• Supports proper exhaust hood performance
• Helps maintain code-compliant airflow

5. Better Air Quality

• Continuously replaces contaminated air
• Removes grease, smoke, and odors more effectively
• Creates a cleaner, healthier kitchen environment

What Happens Without a Makeup Air Unit?

Skipping a make up air unit can lead to more than just discomfort, it can create real operational and safety problems:

• Exhaust hoods underperform due to poor airflow
• Cold air enters through doors, cracks, or vents
• HVAC systems work harder and cost more to run
• Increased risk of smoke buildup and fire hazards

For most commercial kitchens, a makeup air system isn’t optional, it’s essential.

Partner With HoodMart for Balanced, Efficient Ventilation

A high-quality heated makeup air unit is key to keeping your commercial kitchen comfortable, compliant, and running efficiently, especially in colder climates.

At HoodMart, we offer complete ventilation solutions designed to work together seamlessly, including:

• Commercial exhaust hood systems
• Makeup air units and air tempering solutions
• Fire suppression systems
• Hood filters, ductwork, and accessories

Whether you’re designing a new kitchen or upgrading your current system, our team can help you choose the right makeup air unit for your space.

Ready to start your next commercial kitchen project? Get a commercial hood quote to build a balanced, high-performing ventilation system with HoodMart.

Frequently Asked Questions About Makeup Air Units

What is a makeup air unit?

A makeup air unit replaces the air removed by your exhaust hood with fresh outside air, helping maintain proper airflow, pressure, and air quality in your kitchen.

When do you need a heated makeup air unit?

You need a heated makeup air unit in colder climates where bringing in unconditioned outdoor air would negatively impact indoor temperature and comfort.

How do makeup air units improve HVAC efficiency?

By pre-conditioning incoming air, makeup air units reduce the workload on your HVAC system, helping maintain temperature more efficiently and lowering energy costs.

Are makeup air units required by code?

In most commercial kitchens, yes. Local building codes often require makeup air systems to ensure proper ventilation and safe operation of exhaust hoods.

What is air tempering?

Air tempering is the process of heating, or sometimes cooling, incoming air before it enters the building, which is exactly what a tempered makeup air unit does.