Restaurant HVAC Problems: Grease, Ventilation, and Makeup Air

Typical Restaurant HVAC Problems

Between airborne grease, constant cooking, high heat, and strict code requirements, restaurant HVAC systems are under regular stress. Understanding some of the most common HVAC issues for restaurants can help you to take preventative action to minimize your risk of experiencing a disruptive breakdown.

What Makes Restaurant HVAC Systems Different

Restaurant HVAC systems are very different than residential or other commercial systems. Cooking equipment generates a high heat load that HVAC systems must compensate for. They operate continuously for long hours and are often exposed to airborne grease.

Particles, odors, steam, and smoke can all impact the lifespan of a restaurant’s HVAC system. Furthermore, most are heavily regulated by health and fire standards. Restaurant HVAC systems aren’t just cooling your space; they also actively remove contaminants while maintaining proper air balance.

Grease Buildup

Whenever you’re cooking food in your restaurant, especially grilling and frying, it can release tiny grease particles into the air. While some particles can be pulled into your exhaust hood system and captured by your grease filters, that’s not always the case. Rather, it can build up on your hood, filters, ductwork, exhaust fans, and ventilation components.

Grease buildup creates dangerous conditions for your restaurant. Grease is highly flammable. When it accumulates in your exhaust system and air ducts, it can ignite from high heat. Kitchen fires can quickly spread through your ductwork.

As grease builds up inside your ducts, it can restrict airflow. This makes your ventilation system much less effective at actively removing contaminants and heat. Even worse, exhaust motors and fans have to work much harder when airflow is restricted. This leads to increased energy usage, shorter equipment lifespan, and a higher risk of breakdown.

Excessive grease buildup can lead to failed inspections and potential fines from your local health agency. If you notice sticky residue around your vents and hoods or strong lingering odors, you likely have a grease buildup problem. You may have increased kitchen temperatures or even a visible buildup on your filters and duct openings. There may be reduced airflow, and your smoke may not be clearing properly.

One of the most effective solutions to prevent grease issues with your restaurant HVAC system is to invest in regular, professional cleaning service. Opt for daily or weekly cleaning of your hood filters. Be sure to schedule professional duct and exhaust cleaning. Routine inspections of your entire system are necessary to stay ahead of grease buildup to prevent critical safety and compliance issues.

Poor Ventilation

You need proper ventilation in a commercial kitchen. Without it, smoke, heat, and other contaminants can build up very quickly. A properly ventilated kitchen restaurant HVAC system will effectively remove airborne particles generated by your cooking equipment. It should maintain comfortable working conditions and support safe indoor air quality. It should also capture and exhaust grease, smoke, and odors from your kitchen.

Unfortunately, many restaurants deal with ventilation issues. One of the most common reasons is due to an undersized system. If your ventilation system isn’t appropriately sized for your kitchen equipment, it won’t be able to keep up with your demand. Dirty and blocked components can allow dust, debris, and grease to build up. This can restrict airflow throughout your system and reduce its overall efficiency.

An improperly designed hood or bad placement won’t allow your system to fully capture cooking emissions, grease, and smoke, allowing these airborne contaminants to escape into your general kitchen space. Another common ventilation issue is a failing or worn-out exhaust fan. Fans that aren’t functioning properly can’t move enough air throughout your system. A third issue concerns whether you have a manual ventilation system or a sensor-based system. Manual systems require someone to remember to turn them on. Automatic sensors can sometimes fail or become dirty and malfunction.

If your restaurant has poor ventilation, it can lead to a number of different problems. One of the most obvious is excessive heat buildup. Your kitchen temperature can rise very quickly, making working conditions extremely uncomfortable and unsafe for your staff. Without proper exhaust, smoke can linger in the air, and odors can easily spread into your dining areas.

Poor ventilation can lead to indoor air quality issues, like increased exposure to airborne contaminants, and it can sacrifice employee health. Furthermore, poor ventilation can make your HVAC system work harder to compensate for poor airflow. This can increase your energy usage, leading to higher utility bills.

You can improve your system’s ventilation performance by ensuring that it’s appropriately sized for the type of kitchen equipment that you have. If you have upgrades in the future, you may need to alter your ventilation design or size. Aim to keep all the components of your system clean and well-maintained. Be sure to replace any worn-out or failing fans in a timely fashion. Additionally, having a professional conduct airflow testing will help to identify imbalances so that you can fix them before there’s a major issue.

Makeup Air

Probably one of the most misunderstood components of restaurant HVAC systems is makeup air. Makeup air is fresh air brought into your building to replace the air exhausted by your ventilation system. Every time your exhaust hood removes air from your kitchen, it must be replaced with fresh air to maintain a proper balance. If there isn’t a constant replacement of fresh air, the building can become negatively pressurized.

When too much air is exhausted without replacement, your building will start to pull in air from any source possible. These include things like adjacent spaces, cracks, gaps, doors, and windows. You may notice that your doors are difficult to open and slam shut. You may detect uncontrolled air infiltration, drafting throughout your space, and uneven temperatures throughout your building.

There may be back-drafting of your gas appliances. This can allow harmful gases, such as carbon monoxide, to back up inside your building and trigger safety detectors. Furthermore, if you have improper makeup air, it can lead to higher energy costs and reduced performance from your exhaust system.

It’s best to consult a professional to ensure that there’s proper makeup air designed into your restaurant HVAC system. A well-balanced system will bring in the right amount of fresh air and distribute it evenly throughout your space. This ensures that your kitchen maintains neutral or just slightly negative pressure without causing any real issues.

All Three Are Interconnected

Grease, ventilation, and makeup air all operate dependent on one another. Grease buildup will reduce airflow. Poor ventilation can fail to remove airborne contaminants. Improper makeup air can disrupt your system’s balance. When one of these components is off, it affects the performance of the other two. For example, restricted airflow from grease buildup can worsen your ventilation problems. Poor ventilation can increase grease accumulation, and a lack of makeup air can reduce your exhaust effectiveness.

Top-Notch Commercial HVAC Repair Services

Black-Haak offers top-notch commercial heating and commercial air conditioning services in Greenville, WI, and the surrounding towns. We can also assist with all your commercial HVAC maintenance, new installation, and replacement needs. Contact our office today to schedule an appointment with one of our knowledgeable HVAC technicians.