Can You Vent A Range Hood Into The Attic – Is It Good Or Bad?

Venting a range hood into the attic is generally not recommended. It can lead to grease buildup, creating a fire hazard and potentially damaging the attic structure. Most local building codes also prohibit this type of venting. Additionally, it can cause mold growth and decrease the efficiency of the range hood. Instead, venting through the wall or roof is suggested for better safety and efficiency.

We definitely don’t suggest it. Instead of it, we suggest using the wall or the roof of your home to ventilate your range hood. In this article, we will explore the pros and cons of venting a range hood into an attic and ultimately explain why we don’t suggest using attic ventilation for this purpose.

5 reasons we don’t suggest venting a range hood duct into the attic

Range hoods are an essential piece of kitchen equipment that helps to keep your home’s air clean and free from pollutants. A range hood must be vented but unfortunately, many homeowners make the mistake of venting their range hood into their attic space. But this is a big no-no. Here are 5 reasons why you should never vent a range hood into the attic:

1. It will lead to grease buildup in your attic

First and foremost, doing so can lead to grease buildup in your attic—which can then result in mold growth and other contaminants. This not only negatively impacts the health of those living in the home. But it also affects the structural integrity of your building. Additionally, condensation caused by steam from cooking can damage surfaces within your attic space.

2. It can create a fire hazard

Grease and other particles from cooking can build up on surfaces in the attic and create a fire hazard. In addition, mold and other contaminants can form due to condensation that develops when warm air meets cold surfaces.

3. Local building codes don’t support this venting system

It’s also important to know that most local building codes prohibit this type of venting. As it can create poor air quality in the home or even damage the structure of your house.

According to International Mechanical Code 2015 provided by ICCSAFE, “The ICC Code requires all exhaust fans to discharge to the exterior surface of the building and can’t be discharged to the attic or crawlspace.”

4. Can lead to the growth of mold

The moisture can also lead to the growth of mold within your attic and this is a big problem because mold spores can spread throughout your home. Lastly, venting your range hood into the attic will result in decreased efficiency of your range hood.

5. It will ruin the place

Finally, the increased moisture levels in the area provided by the range hood could lead to issues with wood rot or dry rot, weakened insulation, and even pest infestations.

Are there any advantages of venting the range hood into the attic?

The question of whether or not to vent a range hood into the attic is an ongoing debate. Vented range hoods are designed to remove smoke, heat, and grease from a kitchen, with the belief that by sending these pollutants up and out of the home they’re less likely to be breathed in. But what about venting them into an attic?

We decided to investigate this topic further in order to determine if there were any advantages of venting a range hood into an attic. But unfortunately, we couldn’t find any! Not only does vented air increases the risk of condensation within your attic space and possibly damaging your insulation, but the hot air can cause added strain on your cooling system during those hot summer months.

How to vent the range hood through the attic?

Although venting range hoods into the attic is not suggested by me I will share how to install it. It can be a tricky task, especially when it involves running ducting through the attic. But with some planning and preparation, you can easily vent your range hood through the attic. Here is a step-by-step guide to help you get started.

1. Choose the ducting material

First, plan ahead of time by assessing which type of ducting material will work best for your project. You’ll need to factor in things like the length of the run from your range hood to the outside wall, as well as any bends or turns needed in order to complete the installation. Once you’ve determined which type of ducting best suits your needs, purchase it and have it ready for installation.

2. Identify the place

Next, identify where you’ll run the ducting from inside your home up into the attic space. It s important to take measurements and make sure you ll have enough space in your attic to accommodate the required ducting.

3. Mark and measurement

Next, remove the vent cover from your range hood and measure the width of the ducting you’re using. Using a pencil or pen, mark this measurement onto your range hood s existing ducting. Now, cut off any extra length of ducting that hangs below your marked line.

4. Connect the ducting to the attic

Once you have done this, it s time to connect the ducting from inside your home up into the attic space. This is where you’ll need to use your ducting reducer. If you’re using a 4-inch vent, use a 4-inch reducer.

5. Connect the duct to the range hood

Finally, you’ll need to connect the vent to your range hood. To do this, simply put the reducer over the ducting that s coming up from inside your home and then slide the vent into place.

Is it a big deal if I leave it like that for a few months or is this a safety risk that will require proper installation soon?

The longevity of any attic depends on various factors such as insulation, ventilation, and temperature. Venting your kitchen range hood into the attic can only be a solution if you don’t have an outside exhaust vent. However, this isn’t an ideal option and should only be done as a last resort.

Leaving your exhaust vent in the attic for too long could potentially cause serious damage to your home.

So, how long can you safely leave it vented in the attic before causing irreparable damage? The answer largely depends on several factors such as ventilation system type, insulation in the attic, and local climate conditions. Generally speaking though, if your range hood is vented to the attic maybe it can last for 6 to 10 months without being ruined it.

Alternatives to Attic Venting

There are several other ventilation systems designed to do the same job, all with their own unique benefits.

Wall venting is the most popular venting option for range hoods. Wall venting involves attaching an exhaust fan directly to an exterior wall, where it can pull in air and push out smoke or steam more effectively than through a ceiling or roof fan alone.

Roof venting can be your perfect range hood venting option too. Roof venting has a plethora of benefits that can make your home more comfortable and energy efficient.

Other alternatives include basement ventilation systems. If you don’t want to keep the ductwork visible at all in your house then you can go for basement ventilation. moreover, you can use the basement for all of your plumbing and electrical setup with using it for ventilation.

What are professionals say about the range hood vent into the attic?

As the popularity of range hoods increase, homeowners are often asking if they can vent their range hoods into the attic. Professional opinions on this topic vary and depend on several factors.

However, professionals suggest that you not vent range hoods into the attic as it can cause damage and create costly repairs.

Sam Lee brand ambassador at Steinberg ArmaturenIt says “It is important to avoid venting your range hood into the attic because it can lead to moisture build-up, which can create mold and mildew growth in your attic space. This leads to dangerous health risks for anyone living in the home, not to mention expensive repair bills from needing to address water damage caused by this issue.”

Furthermore, when vented incorrectly it causes poor air circulation and an inefficient appliance which increases energy costs for homeowners. The advice of professionals should be taken seriously when considering where your range hood should be vented out of your home safely and efficiently.


Venting your range hood into the attic is not recommended as a long-term solution. It can provide a temporary fix while you consider replacing your existing hood and venting outdoors. With proper ventilation, maintenance, and installation, venting your range hood into the attic is a viable option. Regularly clean the filter and inspect the exhaust tube to ensure proper ventilation.

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