This is one of the questions that we get the most! There are many different factors at play that contribute to determining your CFM needs. These are things such as range type, size, and cooking habits. Every kitchen and cook is different so use our handy guide below to find just the right CFM range for your stove hood.
Below are a few factors that determine how many CFMs you need in your range hood. For more information about selecting the right range hood for your home view our helpful Range Hood Buyer’s Guide.
1. Gas stoves
Gas stoves are very fast burning, and will require a higher CFM than electric stoves due to the fact that there is an open flame emitting gas and other fumes. If your range hood is bigger than the range, then the usual rule is finding the BTU’s your stove produces and divide that by 100.
The common ranges come with around 5,000 – 12,000 BTU’s / Burner. Making it usually a 20,000 – 72,000 BTU’s. The perfect range hood would have 200-700 CFM for the average oven. There are of course stronger stoves in the market, making it sometimes necessary to go up to 2000 CFM. If you have the same size range hood as your range or smaller, you might want to get a higher grade range hood to compensate.
2. Electric stoves
Electric stoves are generally smaller and provide less heat, making higher CFM’s unnecessary. Although, if you cook often with strongly spiced food or food that produces a lot of smoke we always suggest you to get stronger blowers. For electric ranges the way to figure out the minimum amount of CFM’s is first by figuring out how many kilowatts your range uses. Then a simple calculation should give you the amount of BTU’s (1 kW = 3,412 BTU’s/hr). Then just as with gas stoves, to find the necessary CFM you will take the amount of BTU’s and divide the number by 100 to find the amount of CFMs your hood will need.
Usually it won’t be a perfect number, so always round it up to make sure you have your CFM needs covered. Regular stoves use 3 kW per burner, making it comparable to 10236 BTU’s/hr, in other words you will need 102 CFM’s (200 CFM’s rounding up) per burner. Usually with 4 burners a 800 CFM range hood will be more than enough.
You will need extra CFMs if you…
- Cook in high temperatures or extremely spiced food
- Use multiple burners at the same time
- Have a range hood too far up from your range
- Flat designs for range hoods.
You will need less CFMs if you…
- Have a small place with no make-up air
- Don’t cook too often