Can You Use Flex Duct For Range Hood -Discover Flexible Solutions

When it comes to creating a safe and healthy home, the materials and products you choose are an important part of the overall picture. Ducts that you will use as your range hood venting is very important. Because range hoods must be vented outside. A flexible duct is an appealing option for many people as it can be used for a variety of applications, including use in range hoods.

While flexible duct for a range hood may seem like the perfect solution for one-time installations, but is this option safe and suitable for range hood exhaust? 

There are some considerations before using it in a range hood that could be harmful to your home. We will discuss the pros and cons of using flexible duct in range hoods, as well as how it can be harmful to your home.

What are the advantages of using a flexible duct for your range hood venting?

First, we will talk about the advantages of using it. This type of duct has several advantages over rigid metal pipes or solid walled options.

1. Cost-effective: Flexible ducting is less expensive than traditional rigid pipe materials and can be easily installed with minimal tools.

2. Flexible: They also offer improved flexibility when it comes to ventilation routing and allow for easy adjustment in tight spaces or awkward angles where other vent types may not fit properly.

3. Lightweight: Additionally, flexible ducts are lightweight and easy to transport and install, even by one person. These ducts can be installed in any position.

What are the disadvantages of using it?

Here are some drawbacks associated with this type of venting that are important to consider when deciding whether or not a flexible duct is suitable for your needs. Even I found disadvantages more than advantages. That’s why I don’t recommend it as a range hood venting duct.

1. Lower ability to maintain air pressure: The primary disadvantage of using a flexible duct is its inability to maintain continuity in air pressure. When an obstruction such as a kink forms in the duct, it can create resistance which causes airflow problems.

2. Is not fire resistant: In addition, the material used in flexible ducts is typically not fire-resistant, so they should be avoided if you plan on installing a range hood close to combustible materials.

3. Accumulation of Grease: Flexible ducts can be more difficult to clean than rigid ducts. And are more prone to accumulating grease and other debris that can build up over time and reduce airflow.

4. Code Compliance: Some building codes may require the use of rigid ducts for range hood venting. Particularly in commercial kitchens or other high-use environments.

5. Not durable: Finally, unlike rigid metal or PVC vents, flexible ducts are more susceptible to tearing or puncturing over time. As such, regular maintenance may be required.

What are the codes for using a flex duct to vent the range hood?

What are the codes for using a flex duct to vent the range hood?

Flex duct is inexpensive, easy to install, and can be used in a variety of applications. But before you start your project, it’s important to know the codes and regulations for using flex duct in this type of situation.

The International Residential Code (IRC) has some specific rules that must be followed when using flex duct to vent a kitchen hood. According to chapter 15 of the 2023 version The IRC does not directly prohibit the use of flex ducts, but what it does do indirectly prohibits flex ducts. They say the interior of the duct must be smooth and the duct must be metal constructed. Which will not work if the thickness is less than 0.0157.

If you go to the next chapter, that means chapter 16. It says that the appliance you’re using the duct for can’t produce more than 250 F of heat. And the duct needs to be tested to see if it’s OK at 250 F. If it passes the test only then it is permitted to use as a venting duct.

I don’t think a flexible duct can handle that much heat easily.

Now, can you use a flex duct for range hoods?

Yes, you can use a flex duct for range hoods. However, this is not recommended. Flexible aluminum ducting is an inexpensive and easy-to-install option for short runs of ventilation. But the disadvantages are more when it comes to range hoods.

Additionally, flexible duct work can be prone to noise from vibrating. Which is especially noticeable if installed on longer runs or tighter bends. I forgot to add this disadvantage to the list. To get adequate ventilation performance from a range hood duct and reduce noise levels at the same time. Rigid metal or insulated ductwork should always be used instead.

What are the problems of using flex ducts in different ductwork?

What are the problems of using flex ducts in different ductwork?

Range hood venting is a crucial part of your kitchen exhaust system. So proper installation and maintenance are essential for the proper functioning of your range hood. Flex ducts are often used for range hood venting due to their affordability and flexibility. But there can be problems when using them in different venting places.

When deciding where to place the flex ducts for your range hood venting, it’s important to consider the type of location you have available. If you can run the duct directly through a wall it will be easier than the roof. But it will be more difficult to do installing it into a soffit or chimney.

However, if you need to use a soffit or chimney as an exit point for your ventilation system, then flex duct can’t provide adequate performance.

By the way, don’t vent your range hood into the attic because this will create a fire hazard!

Which type of duct for my range hood will be perfect?

Which type of duct for my range hood will be perfect?

When it comes to venting a range hood, choosing the right type of ductwork is key. The efficiency of your hood depends on selecting the correct range hood venting options.

Rigid steel or aluminum ducts are a best type if you’re looking for long-term durability and airtightness. Their rigid structure ensures that they don’t sag or develop kinks over time. And their metallic finish provides excellent corrosion resistance. While these materials are more expensive than other types of ducting, they can last up to 10 years with proper maintenance.

If rigid ductwork isn’t in your budget, there are plenty of semi-rigid ducts that may be suitable for your needs. If you want to get an unconventional extra cost-saving solution then you can think about your dryer vent. Yes, it is possible too. But only when you have no other way.

Considerations for Installing Flex Duct to vent a range hood

Although I don’t recommend using flexible ducts for your kitchen vent hood. When you are bound to use flex duct then there are a few key considerations to keep in mind. Proper sizing is essential when it comes to any HVAC system.

Flex duct should be sized correctly and with proper air flow in mind. It must fit correctly within the space available and shouldn’t restrict air flow or pressure. Additionally, insulation should be considered for long runs of flex duct as it will help maintain efficient temperatures throughout the system.

When installing flex duct, mounting hardware should also be used properly for secure connections between joints and components. This helps ensure that no leaks occur during operation.

Lastly, take care when cutting the flexible hose material so that a clean cut is achieved without damage or warping of the material. This will help reduce vibration and noise during operation.

What temperature can flex duct withstand?

Flexible air conditioning ducts are generally designed to withstand temperatures between -20°F and 140°F without any problems. Unfortunately, they do not handle temperatures much higher or lower than this very well. The thermal shock of extreme cold can cause them to crack or break. And the high temperature can cause the material to become brittle.

When installing a range hood, using the proper duct for your range is essential to ensure efficient operation. Flexible ducts are often used as they are convenient and easy to install in tight spaces. However, many homeowners don’t realize that flex duct does have some limitations when it comes to withstanding temperature from a range hood.

Flex duct can stand temperatures up to 180° F but no higher than this. If you need a more durable option than flex duct, rigid metal piping is recommended.

Because it can withstand temperatures up to 250° F. Which is much higher than the low temperatures produced by most range hoods on the market today. Additionally, rigid metal piping will last longer and provide better insulation over time.

So, from this point of view rigid duct is the best.


Using a flex duct for a range hood is not recommended due to the potential disadvantages it can cause. Not only does it pose a risk of fire, but it also has the potential to restrict airflow. It’s much wiser to invest in ductwork that is constructed from more durable materials than flex duct.

If you are looking for an efficient and safe way to ventilate your range hood, you should look into rigid metal. Or aluminum pipes that are designed specifically for this purpose.

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