What is Good CFM for a range hood – How many cfm do i need?

Range hood is an absolute solution to unwanted heat and fume in your kitchen, but only if it has required cfm. Check the CFM rating of the range hood. CFM stands for cubic feet per meter, and it represents the air pulling ability of the vent.

If you want to know what is a good cfm for a range hood and how many cfm does your range hood need, I am here to help you. In this guide, I am going to share a detailed guide on range hood cfm which includes:

  • How to choose the right cfm for your range hood
  • Factors to consider
  • How to calculate cfm

Factors to consider

Following are the factors which affect the functionality of your range hood. You must consider these things before going for a specific cfm.

Fan size

A range hood is all about a top quality fan. Your range hood efficient depends on the size of the fan. On average, a range hood fan must have a minimum of 100 cfm if your stove size is 12 inches. It means that your stove size is 30 inches, the cfm should be 250.

30″ Range Hood

If you have a standard 30 inches range hood, then all you need is a minimum of 100 CFM. However, it is highly recommended to go with an ideal 250 CFM if your range hood is 30’’.

36″ Range Hood

For a 36″ range hood, you need a minimum of 120 CFM.  But recommended ideal CFM for a range vent of 36″ is 300 CFM.

48″ Range Hood

For a 48″ range hood, you must go for a minimum of 160 CFM. But if you want perfect ventilation, then ideal CFM for a 48″ range hood is 400 CFM.

Room size

It’s better to take into account your kitchen space in cubic feet when calculating the cfm needed since for a bigger kitchen more venting is required to clear the air than a smaller room.

An ideal range hood is one that circulates the air at least 15 times per four minutes. You can find the required CFM by calculating the room space.

If your kitchen is 18’ long x 18’ wide with a 9’ceiling, it would contain 2,916 cubic feet of space:

18’ wide x 18’ long x 9’ high = 2,916 cubic feet

To find the right CFM for your size kitchen, multiply the number 2916 by the number of air circulation (15), then divide by the number of minutes in an hour (60).

2,916 cubic foot room x 15 air exchanges = 43,740 cubic feet moved per hour

43,740 cubic feet ÷ 60 minutes = 729 CFM

You can also go with an easier calculation.

2,916 cubic foot room ÷ 4 minutes = 729 CFM

Stove type

Do you have a gas stove or an electric stove? Make sure to consider your stove type before going for a specific CFM. The gas stove produces more heat and for that, more ventilation is required. If your hood’s CFM is low, chances are that it will be unable to throw out the heat efficiently. That is why you need a high CFM for gas cooktops.

However, for electric stoves, you can even go with a low CFM as they don’t produce that much heat.

Range hood noise

A larger range hood can have a less powerful fan in order to minimize the noise produced. So I would suggest you install a powerful fan that comes with variable speed control. This way you can have better ventilation with less or no noise.

Is 400 cfm good for my range hood?

If you calculate your room size with the above mentioned method and the resulted CFM lies around 400, then it’s good to go with that. But if your calculated CFM is higher or lesser, then you should go with the recommended CFM. 

Is it better to have a higher cfm?

It totally depends on the size of your kitchen space and the heat produced. If your cooking time is more than 1-2 hours, then you should go with a higher cfm. Other factors include fan size, cooktop type, and cooking style, etc.

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