What Size Duct for Range Hood


There are a few factors to consider when selecting the size of duct for your range hood. The first step is to determine the CFM (cubic feet per minute) of your range hood. This is the amount of air that will be moved by the range hood and is a key factor in determining the size of duct you need.

To find the CFM of your range hood, look at the label or manufacturer’s specifications. Once you have determined the CFM, select a duct size that is equal to or greater than the CFM of your range hood. The next factor to consider is the length of duct needed.

The longer the duct, the more resistance it will have and therefore, you will need a larger size duct to maintain proper airflow. To calculate the length of duct needed, measure from where the exhaust will exit the back of your rangehood to where it will connect to either an exterior wall cap or an interior inline fan.

When it comes to range hoods, one size does not fit all. The size of the ductwork needed for a range hood depends on the make and model of the hood, as well as the type of stove or cooktop being used. For example, a small under-cabinet range hood may only need a 3-inch duct, while a larger island range hood may require a 6-inch or even 8-inch duct.

The best way to determine the size ductwork needed for your range hood is to consult with the manufacturer or an experienced contractor.

Range Hood Duct Installation issues, Troubleshooting and Problem Solving

Can You Use 4 Inch Duct for Range Hood?

No, you cannot use 4 inch duct for a range hood. The minimum size duct required for a range hood is 6 inches.

What Type of Duct is Best for Venting a Range Hood?

The answer to this question depends on a few factors, including the type of range hood you have and the layout of your kitchen. If you have a vented range hood, the best type of duct to use is a rigid metal duct. This type of duct is more durable than flexible ducting and will not kink or collapse when installed properly.

If your range hood is non-vented, then the best type of duct to use is a flexible aluminum duct. This type of duct is less likely to cause leaks and is easier to install than rigid metal ducting.

How Many Cfm is a 4 Inch Duct?

A 4 inch duct is typically used for exhaust fans in small rooms or for supplying air to a single appliance. The amount of CFM that a 4 inch duct can provide depends on the length and width of the duct as well as the type of fan that is used. A 4 inch round duct has a cross sectional area of 12.57 square inches.

If the duct is 10 feet long and has no bends or restrictions, then it can carry 165 CFM of air flow. However, if the same 4 inchduct is 50 feet long with two 90 degree elbows, then it will only be able to carry 24 CFM of air flow. The type of fan also plays a role in how much airflow it can provide.

A standard bathroom exhaust fan typically produces about 80 CFM while more powerful inline fans can produce up to 400 CFM.

What Size Vent Hood Do I Need for 36 Inch Range?

Vent hoods come in all shapes and sizes, but when it comes to range hoods, size definitely matters. The rule of thumb is that your vent hood should be at least as wide as your cooktop or range. So, if you have a 36 inch range, you’ll need a minimum of a 36 inch wide vent hood.

Of course, there are other factors to consider when choosing a vent hood besides just width. You’ll also want to think about the height of the unit (most are between 20 and 60 inches), the style of the ductwork (if any), and theCFM (cubic feet per minute) rating. The higher the CFM rating, the more powerful the fan will be and the better it will be at clearing out smoke and odors from your kitchen.

So, while there’s no definitive answer to what size vent hood you need for a 36 inch range, following these guidelines should help you choose the right unit for your needs.

What Size Duct for Range Hood

Credit: www.prolinerangehoods.com

Range Hood Duct Size Calculator

There are a lot of factors that go into choosing the right range hood for your kitchen. One important factor is the size of the ductwork. The wrong size ductwork can result in poor ventilation and even fires.

The Range Hood Duct Size Calculator takes all of the guesswork out of choosing the right size ductwork for your range hood. Simply enter the dimensions of your kitchen and the calculator will do the rest. In addition to helping you choose the right size ductwork, the Range Hood Duct Size Calculator can also help you troubleshoot problems with your existing range hood.

If you’re having trouble with poor ventilation or excessive smoke, chances are it’s because your ductwork is too small. Use the calculator to find out what size ductwork you need and get it installed as soon as possible.

7 Inch Duct for Range Hood

If you’re in the market for a new range hood, you may be wondering what size duct you need. Most range hoods require a 6″ or 7″ duct, but it’s important to check the specifications of your particular model to be sure. The main advantage of using a 7″ duct is that it will allow more air movement than a 6″ duct.

This is especially important if your range hood has high CFM (cubic feet per minute) rating, as this means it will move more air and therefore require a larger duct. Another consideration is the length of your duct run. If your run is longer than about 10 feet, you may want to upgrade to a 7″ duct to prevent any loss of airflow.

Ultimately, the decision of whether to use a 6″ or 7″duct for your range hood comes down to a combination of factors including the CFM rating of your hood and the length of your duct run. Be sure to consult the specifications of your particular model before making your final decision.

8 Inch Duct for Range Hood

If you’re in the market for a new range hood, you may be wondering what size ducting you need. Range hoods are typically available in 6 inch or 8 inch ducting options. So, which is best for your needs?

The answer may depend on the specific range hood you select. Some range hoods come with adapters that allow them to be used with either 6 inch or 8 inch ducting. Others are designed for use with only one size.

When it comes to choosing between 6 inch and 8 inch ducting, there are a few things to keep in mind. First, consider the CFM rating of the range hood. This is a measure of how much air the hood can move and will be an important factor in determining the appropriate size ducting.

Next, think about the layout of your kitchen and where the range hood will be installed. If the Hood will be located close to an exterior wall, 8 inch ducting may be a better option since it will provide better airflow than 6 inchducting. On the other hand, if the Hood will be located further away from an exterior wall or if there are any obstacles (like cabinets) in between, 6 inchducting may suffice since it’s more flexible and can navigate around obstacles more easily.

Finally, consider your budget. 8 Inch Duct all costs more than 6 Inch Duct so if price is a concern, stick with six inches.


When it comes to range hoods, size does matter. The general rule of thumb is that your range hood should be at least as wide as your cooktop or range. But what if you have a large cooktop or range?

In that case, you’ll want a larger range hood to ensure proper ventilation. If you’re not sure what size duct for your range hood, the experts at HoodMart can help. We carry a wide variety of range hoods in different sizes to suit your needs.

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