What Size Exhaust Fan Does Your Kitchen Need?

If you’re setting up a new commercial kitchen, planning a kitchen upgrade, or facing an unexpected equipment replacement, you’ll likely need a new exhaust fan system. Selecting the right exhaust fan size for your specific kitchen application is critical to ensure optimal ventilation and performance. An improperly sized exhaust system can lead to issues like inadequate filtration of airborne contaminants, excess energy consumption, and even disruptions to other kitchen appliances. In this guide, we will explore key factors to consider when choosing the correct exhaust fan size for your kitchen with the experts at NAKS, Inc., your trusted partner for all your commercial kitchen needs.

Why IS CFM (Cubic Feet Per Minute) So Important In Commercial Exhaust Systems?

CFM, or Cubic Feet per Minute, is a crucial metric when determining the effectiveness of your exhaust fan. It represents the volume of air that the fan can remove from the kitchen space per minute. Choosing the right CFM is essential to ensure that the exhaust system can efficiently remove grease, moisture, heat, and other airborne contaminants. If the CFM is too weak, the system won’t effectively clear the air, potentially leaving behind unwanted particles. Conversely, if the CFM is too high, it can create negative pressure and unwanted drafts throughout the kitchen.

Other Factors To Consider When Selecting A Commercial Kitchen Ventilation System

  • Size & Location

The exhaust hood is the foundation of any exhaust system, and its proper size and placement are vital. Begin by identifying where the exhaust hood needs to be installed over your kitchen equipment. Then, measure the mounting location to determine the correct fan size. An ideal placement should complement the kitchen’s layout and ensure efficient ventilation.

  • Type of Cooking Equipment

The specific cooking methods and appliances used in your kitchen greatly impact the exhaust fan size. For instance, if your kitchen involves deep frying, grilling, or cooking methods that generate substantial grease, you’ll need a more powerful exhaust fan capable of handling the extra load of removing grease, smoke, heat, and odors. Similarly, solid fuels like wood are used for cooking and releasing creosote particulates and other contaminants, necessitating a stronger exhaust fan.

  • Ductwork

Ductwork is what connects your exhaust hood system to the outside of your building. Depending on the exhaust hood’s location, you may require an extended length of ductwork. This, in turn, demands a powerful fan capable of efficiently moving air across the entire length of the ductwork and returning clean air to the kitchen. Remember, the longer the ductwork, the more powerful the fan you’ll need. It’s important to keep in mind that some kitchens don’t have any ductwork at all and instead rely on ventless hood systems. Consulting an expert like NAKS, Inc. can help you decide if your kitchen could be served by a ductless system.

  • Roof Curb Sizing

When installing a new exhaust hood system, determining the correct roof curb size is crucial. Factors such as the style and slope of the restaurant roof and the curb’s location all come into play. While a contractor can assist with this determination, you can refer to the roof curb size from your previous setup if you’re upgrading your system.

By taking into account CFM, cooking equipment, and more, you’ll be able to accurately assess your exhaust hood system’s strength and power requirements. If you require assistance or still have questions, our experts at NAKS, Inc. are ready to lend a hand. We offer a diverse range of exhaust hood systems, from options like Compensating (Short Cycle) to Perforated Supply Plenum PSP, and we also provide all the essential accessories, including no-weld Grease Duct, hood filters, canopy hood lights, and curbs. Contact us today to discuss your unique needs!


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