We have detailed home guides, product reviews, inspection advice, and much more. Do you want to know how much CFM you need for your range hood?
Choosing the right CFM is important for an effective range hood not undersized or oversized. In this guide, I will go over What's In This Guide? What Is CFM? Negative Air Pressure Hazards.
It basically says how powerful the fan moves air. Here is an example of typical burner BTUs Burner 17, BTU 2. Burner 15, BTU 3. Burner 9, BTU 4. Burner 9, BTU 5.
Negative Air Pressure Hazards It's important to be aware of potential problems with negative air pressure in a home. Makeup Air Systems With Motorized Dampers Homeowners should be aware that installing a makeup air system can be an elaborate and expensive endeavor.
This can cause carbon monoxide poisoning in a home. Quality of Ducting It is highly recommended that you only use smooth metal ducting for your range hood.
Vent Reducer It is best to always go with the built-in duct size of your stove hood. Since your fan must pull the air through the filter and out through the duct to the vent, the length of the ductwork is an additional consideration.
Common ducts are round and about 6 inches in diameter. For each foot of pipe, add one additional CFM. With all the different factors to consider, which calculation is the right one?
Pick the biggest CFM number. Other features to look for include variable fan speeds, dish-washer safe baffle filter, touch panel operation, energy-saving LED light, and of course, a hood style that fits your aesthetic. Hauslane range hoods offer high performance range hoods that will work for most of the kitchens. Blowers in Hauslane range hoods approach, or exceed, professional grade. Ideally, your range hood is the same size as your cooking surface, has a powerful, quiet fan, a good filter, and a vent to the outside.
Unfortunately, that is not always the case. Common range hood issues include:. Most websites say you lose 25 CFM on a 90 degree bend.
Following these websites which are written by non-tech people who don't seem to bother that they are providing wrong information that costs people would simply blow up the CFM you require. My calculator works by first determining the CFM you need and displaying these requirements to you based on the different criteria.
There is also a specific output highlighting the minimum and recommended capacity using the HVI suggestions. You would not necessarily be picking the maximum CFM based on the different values. For example, you may originally calculate the CFM based on the volume of your kitchen, but later decide that it just blows up and is not something you would want to stick to. Therefore, when determining the losses due to duct efficiency, I do not give you the ultimate losses or the excess CFM you would need, because I do not know which CFM you decide to go by.
Instead, I give you a factor that you need to multiply the chosen CFM by in order to determine the actual output you would receive if you were to buy a range hood with that particular CFM.
For example: If the CFM is determined to be and you have 12 feet of non-flex ducting with one degree bend and a roof cap, the calculator would do this:. The actual CFM you receive is now - 1.
The total loss so far is This is a loss of 21 CFM. The output of the calculator for the losses, in this case, would be 0. All you do is take this number and multiply it by the CFM you need, i. For the tech people out there, check out this page on the Engineering Toolbox to help you determine the precise losses for your installation. This page talks about the perfect duct diameter for minimal losses and noise. Please make sure you follow manufacturer recommendations and do not make any modification to the duct diameter unless you know what you are doing and are aware that this could void your warranty.
Finally, you acknowledge that this calculator is developed to serve as a guide and you are advised to speak to a local expert to determine the exact CFM that you need. I am not responsible for the wrong use of this calculator nor if the output is ever erroneous nor if the methods used are faulty. Relevant links and verifications have been provided for every step of the process and the results are good for use to the best of my knowledge and understanding.
For most homes CFM is all you would need. Also, if you go above CFM many municipalities require that you additionally install a system for make up air while you install your range hood. To determine the exact CFM you would need, I suggest you use my free calculator. There are different factors that you need to take into account such as the location of your stove, the output of the stove and for kitchens with absolutely no other exhaust, the volume of the kitchen, too.
The deciding factor in most cases is the power output of your stove. For gas stove, most websites suggest that you need 10 CFM for every BTU, but this is wrong and you actually only need 6. This difference adds up and makes a difference! I have explained the math behind this if you want to know more. For electric stoves, for every To determine the CFM you need based on the volume of your kitchen, divide the total kitchen volume by 4.
Check out my answer above for some details, but in short it depends on the location of your stove, the power output of the stove and the volume of your kitchen which is not always a necessary factor. Complete details on how you can calculate it yourself and a range hood CFM calculator that does it for you are found above on this page. If you are building your own range hood, you would want to make sure that you size your ducting such that the flow rate is at a certain optimum within certain limits so that noise and unacceptable friction losses are avoided.
It is important to install a range hood that is not larger than what you should have to get the best value and functionality. A larger range good may have a less powerful fan to reduce the amount of noise when powered on.
Another option is to install a powerful fan in a range hood with variable speed control. All these features deliver good performance without getting too noisy.
A quiet fan will have a rating of 65 decibels, which can be compared to the level of a conference room conversation. For instance, a burner with an output of 35, BTUs requires a kitchen range hood that provides CFM to clear the air effectively. However, purchasing a range hood with a higher CFM comes with its downsides as it produces a louder sound. Purchasing a range hood with a lower CFM might fail to suck up all unpleasant odors, smoke or steam from the kitchen leading to poor indoor air quality.
Keep in mind that some cities have restrictions on the amount of power a blower can have. It is important to consider these factors when purchasing a range hood to avoid expensive lawsuits that might unfold in the future.
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