Range hoods vented outside are a great way to remove odors , heat, smoke, and moisture from your house when cooking.
They are mounted right above the cooktops, and are equipped with a fan that can pull air through the ducts and finally outside the kitchen.
There are many non-ducted range hoods that simply re-circulate the air after cleaning it through their charcoal filters.
While vent hoods are not required by local building codes in most states, cooking without them may lead to stagnating smells and smoke in the kitchen, or maybe the entire house.
Their airflow capacity of range hoods is rated in CFM or cubic feet per minute.
For precise sizing, it’s important how to properly calculate CFM for vent hoods. It’s important to purchase range hood that moves sufficient air to be effective.
Bellow I will show how to calculate and pick the proper CFM of a kitchen range hood.
Table of Contents
- How to Calculate Range Hood CFM & Fan Size
- Calculate CFM considering the Room Size
- Calculate CFM considering the Gas Stove
- Calculate CFM considering the Range Hood Ductwork
- Should Your Range Hood be wider than Cooktop?
- How to Choose the Correct Width of Range Hood?
- How to Increase the Efficiency of your Range Hood?
- Best Range Hoods Ranked by CFM Power
How to Calculate Range Hood CFM & Fan Size
Ideally, a hood fan should be able to move minimum of 120 CFM air for each 12 inches of stove’s width. That means, if your kitchen has a 32 inches wide stove, you will need a hood equipped with a fan that can move at least 320 CFM of air.
32 inch wide cooking stove X 100 = 320 CFM should be the min vent hood fan size.
For final calculation, take a larger CFM range hood rating for your stove width, stove burner, and room size. Also add additional CFMs required for the ductwork to arrive at the minimum CFM vent hood to buy.
In the above example, if your kitchen area has a 35 inches stove (300 CFM minimum) in a 15 feet x 15 feet x 8 feet room (555 CFM minimum), and a 45,000 BTU gas stove (450 CFM minimum), you would need a fan rated at 600 CFM or higher, plus 150 CFM for the ductwork for a total of 750 CFM or more.
Calculate CFM considering the Room Size
It’s important to consider the kitchen’s actual size (in cubic feet) while calculating the perfect size of hood fan necessary, since a larger kitchen areas would need more venting to properly clear the air than a small room.
Your range hood should have power to exchange the kitchen’s air at least 20 times an hour or every ten minutes. For instance, if your kitchen is 18 inches long and 18 inches wide with an 10 inches ceiling, it would contain 2,155 cubic feet.
18 inches wide x 18 inches long x 8 inches high = 2,155 cubic feet
To find the exact fan size for your kitchen, multiply the room’s cubit feet area by number of air exchanges 20, and then divide this number by number of minutes in an hour (60).
Calculate CFM considering the Gas Stove
Your gas stove burners produce more heat than an electric range, so if your kitchen has a gas stove, it will require a larger capacity hood vent fan.
You can calculate the fan size for your gas stove by combining BTU ratings for all your stove burners (they range between 4,000-16,000 BTU) with an average of about 10,500 BTU per burner and a total of about 42,000 for a four stove gas burner. Now divide this number by 100 and you will get CFM required for your kitchen with a gas stove.
Calculate CFM considering the Range Hood Ductwork
The shape, size, turns, length, and cap on the vent hood ductwork adds some resistance which reduces the amount of air a range hood fan can remove, requiring additional CFM for the fan.
When you’ve used a round 8 inches diameter, smooth metal pipe, just add one CFM per foot of this pipe, and 30 CFM for every elbow, and 55 CFM for a roof cap.
For instance, if your vent pipe is 15 inches long with three elbows and a roof cap, you will need to add 130 CFM more to the range hood’s fan size ratings above:15 pipe length + 30 elbow + 30 elbow + 55 roof cap = 130 CFM
Should Your Range Hood be wider than Cooktop?
It’s best to choose a range hood 1.4-1.6 times wider than the cooking area of your kitchen stove. This calculation holds true especially for induction cooktops.
If your induction cooktop is 55 cm wide in a 65 cm counter top, make sure your range hood is at least 80 cm wide.
If your cooking area is 75 cm, then your hood should be at least 110 cm wide.
For any kitchen island with an induction cooker, a free-hanging hood needs to be twice as wide as the entire cooking area.
It’s important to consider the cooking hood filter area, but since this information is not always available, it’s best to focus on the overall width of the range hood which is a readily available indicator.
How to Choose the Correct Width of Range Hood?
The width of your range hood is important for its efficient functioning. The real cooking zone is much narrower than the kitchen stove. If you’re using just one pan, the best solution is to place your pan in the middle. But most cookers come with fixed rings, therefore the range hood needs to be wide enough such that it effectively spans all the cooking rings.
The hob (stove) type is important. When you’re using an induction stove, you need a wider range hood than for traditional stove types. It should be placed high to catch most of the steam and cooking grease before it spreads to the entire kitchen.
Distance between the range hood and stove. It’s best to buy a range hood that’s around 55 percent wider than your stove, providing about 90-100 cm between hood and stove. This ensures efficient removal of cooking smells and hot air from the kitchen. This is important especially for induction stove where steam can spread further. The higher distance from worktop to range hood the wider the hood needs to be.
It’s necessary to mount your vent hood high enough. After all, you want to stand comfortably while cooking from you can easily see your pans and pots.
How to Increase the Efficiency of your Range Hood?
If you feel your range hood doesn’t extract as well as it should, you would like to boost its performance for better efficiency and cleanliness in your kitchen. We are providing few tips that can increase the efficiency of your range hood.
We hope this comprehensive and easy-to-understand guide will help you in choosing the best range hood for your kitchen.
Best Range Hoods Ranked by CFM Power
Once you have calculated the proper amount of CFM your range hood should have, it is time to pick the best range hood.
Bellow, I have ranked the best range hoods by their CFM power:
600 CFM Range Hood
The Proline Wall PLJW 185 is a perfect choice for those who need a slim range hood that is quite powerful. It uses a 600 CFM blower making it one of the popular option on the market.
The 600 CFM range hood by Proline is an ultra-slim quality product that has been made from stainless steel material.
Its height is 5 inches making it flexible enough to fit anywhere.
It comes with a preinstalled 600 CFM dual blower that is ready to use.
The range hood comes fully assembled in a box and hence enabling you to mount it right away on a wall.
It uses the some of the best baffle filters in the market.
Features, Benefits & Drawbacks
Some of the features offered by the PLJW 185 unit include:
Pros & Cons
Conclusion
If you need a popular range hood product that is slim and has a strong airflow rating, then the PLJW 185 would be your ideal product. It comes with a blower whose airflow rating is 600 CFM. It has features that are easy to use and maintain.
400 CFM Range Hood
This is a great product for those people who like modern European style and hotel-like sleek design for an under cabinet range hood. It is an elegant product that suits well within condos and apartments.
The 400 CFM range hood by AKDY has been made using a long-lasting stainless steel material.
It has a black finish and a unique shape that makes it an elegant and attractive product.
It comes with beautiful baffle filters and a push button panel at the front end. This panel gives you multiple options for controlling the range head.
It is generally a stylish, unique, and modern equipment that complements any modern kitchen.
Features, Benefits & Drawbacks
Some of the features of the AKDY AZ1802 range hood include:
Pros & Cons
Conclusion
If you need a 400 CFM under cabinet range hoodd, then this is the right product to choose. It combines modern styling and advanced features to give a unique solution for your kitchen. It also uses illuminated baffle filters that are easy to maintain.
900 CFM Range Hood
This 900 CFM range hood is designed for those who need to elevate their cooking prowess and have the right mix of utility and style. It is a wall mounted unit that comes with a sleek style that easily fits in any kitchen.
The 900 CFM range hood by Cavaliere adopts a traditional design and a modern construction to give you a unit that is both stylish and professional.
It uses a 19 gauge stainless steel material in its construction that gives it a beautiful look.
It also has a dual chamber motor that can efficiently clear the air.
It comes with features like dimmable halogen lights, touch-sensitive keypad, timer function, and mesh grease filters.
Features, Benefits & Drawbacks
The Cavaliere SV218B2 unit comes with the following features:
Pros & Cons
Conclusion
If you need a wall mount unit that can be fitted easily in any size of a kitchen, then the Cavaliere SV218B2-30 is worth your consideration. This unit comes with aluminum grease filters, telescopic decorative chimney, 900 CFM motor, and 30-hour cleaning reminder.
1200 CFM Range Hood
This 1200 CFM range hood by Z Line product has been designed for customers who need an elegant range hood that has superior performance qualities. It is one of the few units on the market that comes with a lifetime warranty motor.
The Z Line 9667-30 1200 CFM range hood is a professional 30-inch wall mount hood that is made of stainless steel material.
The material used is of 430 grade and gives it an elegant and powerful design.
The durable construction combines with the modern design and a lifetime warranty for the motor to make this unit one of the best on the market.
It has a powerful motor that has the capacity to generate a maximum airflow of between 760 and 1200 CFM.
Features, Benefits & Drawbacks
Pros & Cons
Conclusion
If you need a 1200 CFM range hood that has an ultra-modern design, solid construction, and a lifetime warranty motor, then the Z Line 9667-30 is a good choice. It is among the best selling 30-inch models and comes with chimney extensions for up to 12 feet. By acquiring this unit, you are assured of reliable and factory tested performance for many years.
1000 CFM Range Hood
This 1000 CFM range hood has been designed for those who need a versatile and attractive range hood that can work as either a stand-alone unit or an undercabinet application. The unit has been built to handle some of the most demanding applications.
The 1000 CFM range hood by Proling has a simple but elegant design with smooth round edges.
It has been designed to perform as either an under cabinet or wall hood. It comes with energy-efficient lights and a 1000 CFM blower.
It is also equipped with stainless steel baffle filters that are safe and easy to clean.
The range hood has two sockets that can be customized to be used as either extra lights or for heat lamps.
Features, Benefits & Drawbacks
Pros & Cons
Conclusion
If you need a beautifully packaged 1000 CFM range hood that offers superior quality, intuitive controls, and is easy to install, then this is the right choice for you. This unit comes in a stainless steel packaging and has a seamless design. It has a powerful blower and easy to clean baffle filters.
300 CFM Range Hood
This 300 CFM range hood has been designed for those who need to add some slim Italian-inspired range hood design to their kitchen. It is a unit that can quickly upgrade the appearance of your kitchen.
The 300 CFM range hood by Ancona is a stylish product made from a highly resistant and strong 430 stainless steel material.
It has been designed to offer continuous air renewal.
This is by removing cooking greases and fumes.
It comes with easy to use electronic controls, 5-layer mesh filters, and time delay function.
Features, Benefits & Drawbacks
Pros & Cons
Conclusion
If you need an under mount unit that can add flavor to your kitchen with an airflow rating of about 300 CFM, then this is the right product to go for. It has been independently tested and comes with a 430 commercial grade stainless steel. To check out this stylish product, click here.
800 CFM Range Hood
This 800 CFM range hood has been designed for those who need a simple and innovative high airflow ducted range hood that can be installed in a very short time. The model has a slanted housing which provides full coverage for an entire cooking surface.
The BV 30-Inch 800 CFM range hood is a ducted high airflow unit that comes with LED lights and baffle filters.
It has been in a way that makes it easy to disassemble and clean the parts.
Removal of the parts in this unit doesn’t require any specialized tools.
Its slanted housing provides quiet airflow and effective coverage of the cooking surface.
Features, Benefits & Drawbacks
Pros & Cons
Conclusion
If you need a powerful space saving 800 CFM range hood that has a compact design that can comfortably fit in small applications, then the BV 30-inch unit is an ideal choice. This unit has a powerful motor which helps in the faster movement of high air volumes. It has also been made from a long lasting stainless steel material.
500 CFM Range Hood
This is an elegant 500 CFM range hood that has been designed for those who need a European style airy model that is not only beautiful but also functional. This unit has an impressive focal point that augments its surrounding in a perfect way.
The 500 CFM range hood by Broan has a modern canopy Italian glass design that is beautiful and functional.
It is made from a standard stainless steel material and it comes with electronic push buttons.
Its design also includes halogen lighting, 3-speed control, timer function, and aluminum mesh filters.
There is also heat sentry feature which detects heat levels and automatically adjusts the blower settings.
Features, Benefits & Drawbacks
Pros & Cons
Conclusion
If you need an elegant 500 CFM range hood that is powerful enough to clear unwanted air pollution and residual heat in your kitchen, then this is the right pick. It has a powerful internal blower, easy to clean filters, and electronic push controls. This unit will definitely increase the value of your kitchen.
That would be all for now. Thanks for reading!
If you still need any help in choosing or calculating a proper CFM power for your next range hood, be free to comment bellow.