How To Vent A Range Hood On An Interior Wall? (4 Venting Methods)

Determine where you want to vent your range hood

To vent your range hood on an interior wall, you’ll need to cut a hole in the wall for the ductwork. So, it’s important that you know exactly where you want to vent your range hood before continuing with the installation.

Keep in mind that you can always cut a larger hole if needed. But you can’t put the wall back if you cut a hole that is too large.

You might also be wondering: what size ductwork do I need for my range hood? Check out the chart below.

The larger the range hood’s CFM, the larger diamet

The larger the range hood’s CFM, the larger diameter duct you’ll need. Otherwise, your duct will choke the air as it moves to the outside. It puts more strain on the motor to vent the same amount of air through a smaller duct compared to a larger duct.

Your hood will not be able to move the amount of air it is advertised to move. For example, a 900 cfm hood attached to ductwork that is less than eight inches will not be able to move 900 cubic feet of air in a minute.

So, if in doubt, go with a larger duct. To learn more about duct size, check out our complete guide.


#2. Vent To Lower Level

Another option for homeowners is to install a vent to the exterior by going down a level and then horizontally to the outside.

The only problem with this strategy is that the vent must go in-between the interior wall joists, so the range hood (and oven) need to be exactly centered. If your oven and hood isn’t centered correctly, then they will have to be moved so that the center of the hood lines up with the center joist space.

One great thing about this venting strategy is that you can even install a remote blower in the basement. This means that your range hood will be significantly quieter because the blower fan isn’t at the hood, it is in the basement near the exterior wall.

With a remote venting application, it also frees up the kitchen cabinet space above the hood because there isn’t a blower.

Read Also: How To Paint An Old Range Hood?

What materials do you need to vent your range hood on the interior wall?

Here’s a checklist of tools and supplies to ensure

Here’s a checklist of tools and supplies to ensure seamless and successful venting:

  • Manual on how to vent a range hood on an interior wall
  • Level
  • Measuring tape
  • Pencil
  • Utility knife
  • Adjustable wrench
  • Screwdriver
  • Self-tapping screws
  • Aluminum or duct tape
  • An angle grinder, PVC trim, and silicone (for creating a mounting plate)
  • Ductwork
  • Wall cap
  • Hole saw
  • Needle nose pliers
  • Electric drill
  • Clear exterior caulk
  • Safety gloves and goggles

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#4. Venting Sideways To Exterior Wall

The most common vent installation when the hood is on an interior wall is to go horizontally to the exterior.

You basically have two options, you can go through the top of the kitchen cabinets to the exterior, or you can go through the ceiling.

If the ceiling joists aren’t running parallel with the duct run, then you will have to cut holes into the joists. You may or may not be able to cut holes in the joists due to the size of the joist, the type of joist (engineered vs dimensional), and the size of the vent.

Even engineered I-joists have manufacturer limitations on the size of holes that you can cut (and where on the joist). Consulting a knowledgable contractor or engineer, as well as perusing the joist manufacturer manual is highly recommended if you will be cutting joist holes.

If the joists run parallel with the vent duct, then it isn’t a problem, but you will still have to cut the drywall.

Read Also: How To Install A Range Hood Through A Ceiling?

Ceiling Drywall Removal

When you remove drywall, you have two options. You can remove the entire drywall section from the hood to the exterior wall. Or you can just cut two holes in the drywall at the duct entrance and near the exterior wall.Either way, you will be cutting into drywall, and the cost of patching will need to be factored into the installation. If you install the duct in the upper kitchen cabinets, you also need to factor in that you will lose that cabinet space.

Cut a hole 1-2 inches larger than your ductwork where you’ll run the duct from your hood

Your hood will be running for years to come, so you want it to comfortably fit in your kitchen.

One to two inches gives you space to thread the ductwork through the hole so you can attach it to the hood with ease.

Steps for Installing a Range Vent Hood

  1. Use a 6-inch-diameter hole saw to cut a hole through the interior wall surface, directly above the range. Collect the dust with wet/dry vacuum while cutting the hole.
  2. If the hole saw can’t cut through the interior wall in one pass, stop cutting, remove the plaster from the hole, and continue drilling.
  3. If necessary, use a multi-tool to cut wood lath from the 6-inch hole.
  4. Replace the hole saw with a ¼-inch-diameter bit and drill through the backside of the wall sheathing to the outdoors.
  5. From outside, use the 6-inch hole saw to cut through the siding and wall sheathing.
  6. Make a mounting plate by cutting 6-inch-diameter hole through a piece of PVC trim.
  7. Hold the PVC plate against the house siding, and trace around it with a pencil.
  8. Use an angle grinder to cut the siding along the pencil lines.
  9. Apply bead of silicone adhesive around the hole in wall. Press the PVC mounting plate tight to the wall, and secure with screws.
  10. Use duct tape to attach a 6-inch-diameter elbow to the vent cap.
  11. From outside, slide the vent cap into the hole and secure it to the mounting plate with self-tapping screws.
  12. From inside the kitchen, slide an elbow through hole and onto vent cap elbow. Secure with duct tape.
  13. Screw the vent-hood mounting brackets to kitchen wall; be sure to drive the screws into wall studs.
  14. Slide the vent hood into the brackets and secure with screws driven into wall studs.
  15. Make the electrical connections to provide power to the vent hood’s light and exhaust fan.
  16. Install the vertical cover to conceal the exposed ductwork.

Frequently Asked Questions (FAQs):

1. Why should I use a vented range hood?

If you are using a gas oven or cooktop, installing a vented range hood helps in eliminating carbon monoxide and other toxic gases as well as water vapor that lingers in the kitchen.

It is also a good option for electric range users because it easily removes the cooking odor and the steam build-up that could cause mold formation.

2. How effective is the range hood in sucking unwanted air?

The fan of the range hood can easily suck a coupon bond against its filter. The air suctioning ability of this kitchen equipment can effectively remove all the unpleasant cooking smells, pollutants, and other unwanted contaminants in the kitchen, leaving the space clean and safe for the occupants.

3. Can I vent my existing range hood?

While most of the residential range hoods can be vented, it is best to check the installation instructions if it is possible. You can also remove the unit’s filter and check the “knock-out’ spots or the removable circular/rectangular panels that allow for a duct attachment behind or above the hood. 

4. Is it possible to convert and vent a recirculating range hood?

If you are considering a vented range hood by converting an existing unit, you can do it by closing the exhaust location. This location is usually at forehead height. You need to tweak it and send the air through the vent to the outside.

5. How to choose a vented range hood?

When buying a new vented range hood, look for a unit with a fan that can pull a minimum of 120 CFM and a maximum of 600 CFM. This is the recommended range for most residential homes. Higher CFM produces too much ventilation that can cause a variety of issues, including gas fireplace back drafting.

Keep your kitchen a place where your family enjoys healthy food and healthy air. Installing a vented range hood can make a big difference. 

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