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

Decide the place you wish to vent your vary hood

To vent your vary hood on an inside wall, you’ll want to chop a gap within the wall for the ductwork. So, it’s necessary that you recognize precisely the place you wish to vent your vary hood earlier than persevering with with the set up.

Remember the fact that you may at all times lower a bigger gap if wanted. However you may’t put the wall again if you happen to lower a gap that’s too giant.

You may also be questioning: what dimension ductwork do I want for my vary hood? Take a look at the chart beneath.

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

The bigger the vary hood’s CFM, the bigger diameter duct you’ll want. In any other case, your duct will choke the air because it strikes to the surface. It places extra pressure on the motor to vent the identical quantity of air by way of a smaller duct in comparison with a bigger duct.

Your hood will be unable to maneuver the quantity of air it’s marketed to maneuver. For instance, a 900 cfm hood connected to ductwork that’s lower than eight inches will be unable to maneuver 900 cubic toes of air in a minute.

So, if unsure, go together with a bigger duct. To study extra about duct dimension, try our complete guide.

Minimize a gap 1-2 inches bigger than your ductwork the place you’ll run the duct out of your hood

Your hood will probably be working for years to come back, so that you need it to comfortably slot in your kitchen.

One to 2 inches offers you area to string the ductwork by way of the outlet so you may connect it to the hood with ease.


Calculator: How Many CFM Do You Want?

Vary Hood Top, Floor Space Issues & Extra

Picture by Alex Hayden

As a common rule, calculate 100 cfm for each linear foot of cooking floor. For professional-style ranges, the system is 100 cfm for each 10,000 BTUs your equipment places out. Different components come into play as effectively. For each 3 inches a hood exceeds the prompt peak above the cooktop, add 100 cfm.

Island hoods require additional cfm to compensate for cross drafts, so calculate 150 cfm per linear foot for typical cooktops; add an extra 100 cfm to the pro-range estimate. And contemplate the way you cook dinner. In case you hardly ever grill or stir-fry at excessive warmth, you could possibly go together with a decrease cfm than beneficial.

#2. Vent To Decrease Stage

Another choice for owners is to put in a vent to the outside by happening a stage after which horizontally to the surface.

The one drawback with this technique is that the vent should go in-between the inside wall joists, so the vary hood (and oven) have to be precisely centered. In case your oven and hood is not centered accurately, then they must be moved in order that the middle of the hood strains up with the middle joist area.

One wonderful thing about this venting technique is which you could even set up a distant blower within the basement. Because of this your vary hood will probably be considerably quieter as a result of the blower fan is not on the hood, it’s within the basement close to the outside wall.

With a remote venting application, it additionally frees up the kitchen cupboard area above the hood as a result of there is not a blower.

Learn Additionally: How To Paint An Old Range Hood?

Tips on how to Set up Ducts on an Inside Wall

Decide the Least Obstructed Path to the Exterior

Have in mind the 30-foot rule. You do not need your duct to exceed 30 toes in size. There shouldn’t be greater than two elbows within the construction, both. To do that, it’s essential to decide the least obstructed path from the vary hood to the surface.

You should be very accustomed to the inside construction of your own home to do that. Ideally, you must choose a path with no stud, piping, or electrical wiring.

Create Entry Factors

To assemble your air flow duct, it’s essential to have entry to key factors alongside the route of the ducting. This will probably be a lot simpler if you happen to select to vent your vary hood down into the basement or by way of the attic to the roof.

Nevertheless, if you happen to resolve to vent by way of the partitions, you will have to chop by way of them.

In case you aren’t positive what’s in your partitions, don’t try to chop them your self. Seek the advice of knowledgeable first.

Thread the Duct By way of

Relying in your chosen venting choice, thread the duct accordingly by way of the partitions to the surface. Use the entry factors that you simply lower into the partitions to make the job simpler.

One half that it’s important to watch out with is the dimensions of the outlet that your ductwork runs by way of to succeed in the vary hood. To make it simpler for the ductwork to attach, be sure that the outlet is round 2 inches wider than the diameter of the duct.

Join the Duct to the Vary Hood

As soon as the development of the ductwork is full, it’s time to attach it to the vary hood. This step needs to be pretty simple and can often be detailed within the person guide for the vary hood.

Often, all it’s important to do is be part of the duct along with the transition piece utilizing stainless-steel duct tape.

Connect the Wall/Roof Cap

Head over to the place the place the duct ends. If the duct ends on an exterior wall, connect a wall cap.

A wall cap at the terminal of an exterior wall-bou
A wall cap on the terminal of an exterior wall-bound duct.

If it finally ends up on the roof, use a roof cap.

An atypical roof cap at the terminal of a roof ven
An atypical roof cap on the terminal of a roof air flow duct.

The cap will assist shield the duct from particles and the weather, defending it from harm and serving to it run for longer.

Vent Hood Ducts

Picture by PhotoAlto/Odilon Dimier/Getty

Relating to ductwork, it is a numbers sport.

  • •Select ducting that is the identical dimension as or barely bigger than the vent opening. The extra highly effective the hood, the bigger the duct. As an example, a typical 400-cfm unit requires a 6-inch duct, whereas a 1,200-cfm mannequin wants a 10- to 12-inch duct.
  • •For the most effective airflow, use clean galvanized metallic ducting somewhat than versatile or corrugated ducting. Seal joints with duct-joint mastic tape.
  • •Preserve duct runs as straight and brief as attainable. Use gradual, 45-degree turns somewhat than 90-degree ones. The less the turns, the extra environment friendly the system will probably be.

#4. Venting Sideways To Exterior Wall

The commonest vent set up when the hood is on an inside wall is to go horizontally to the outside.

You principally have two choices, you may undergo the highest of the kitchen cupboards to the outside, or you may undergo the ceiling.

If the ceiling joists aren’t working parallel with the duct run, then you’ll have to lower holes into the joists. Chances are you’ll or could not have the ability to lower holes within the joists as a result of dimension of the joist, the kind of joist (engineered vs dimensional), and the dimensions of the vent.

Even engineered I-joists have producer limitations on the dimensions of holes which you could lower (and the place on the joist). Consulting a knowledgable contractor or engineer, in addition to perusing the joist producer guide is extremely beneficial if you’ll be slicing joist holes.

If the joists run parallel with the vent duct, then it is not an issue, however you’ll nonetheless have to chop the drywall.

Learn Additionally: How To Install A Range Hood Through A Ceiling?

Ceiling Drywall Elimination

Whenever you take away drywall, you may have two choices. You may take away the complete drywall part from the hood to the outside wall. Or you may simply lower two holes within the drywall on the duct entrance and close to the outside wall.Both approach, you’ll be slicing into drywall, and the price of patching will have to be factored into the set up. In case you set up the duct within the higher kitchen cupboards, you additionally have to think about that you’ll lose that cupboard area.

Is there a price distinction between vented and unvented vary hoods?

Costs for vary hoods differ wherever from round $80 to greater than $2,000, relying on the dimensions, producer, and design. Many vary hoods in the marketplace can be utilized vented or unvented, so that you’ll pay the identical aside from the added filter or conversion package.

 Above: An under-cabinet range hood in Kitchen of
Above: An under-cabinet vary hood in Kitchen of the Week: A Small Kitchen with Big Personality for Comedian Seth Meyers.

Is a vented vary hood higher than an unvented one?

With out query. It’s far preferable to vent the air outdoor than to recirculate it into the room. A vented hood that removes steam, smoke, warmth, and cooking odors is one of the simplest ways to maintain your kitchen clear, because it eliminates grease particles that might in any other case accumulate in your partitions and cupboards.

Unvented vary hoods do filter some grease and cooking odors from the air, however the common consensus is that they’re nowhere close to as efficient. Nor do they take away warmth and humidity, so that they received’t assist preserve your kitchen cool when you cook dinner.

 Above: An industrial-style vent (made of ducting)
Above: An industrial-style vent (made from ducting) attracts air up and out. For extra, see Kitchen of the Week: A Proper English Kitchen with New England-Inspired Shiplap Paneling.

Required Instruments for this Kitchen Fan Vent Venture

Have the required instruments for this DIY mission lined up earlier than you begin—you’ll save time and frustration.

  • Caulk gun
  • Cordless drill
  • Mud masks
  • Extension wire
  • Jigsaw
  • Tape measure
  • Tin snips
  • Utility knife


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