How-To Videos

How to Vent an Over-the-Range Microwave to the Outside

By: Danny Lipford
Venting an over-the-range microwave

Venting an over-the-range microwave

Many times an over-the-range microwave that recirculates cooking fumes can be converted to exhaust to the outside. Here’s how to go about it:

  1. Remove the access plate on the top of the unit in order to reach the motor. Remove the motor mounting screws on the back of the oven.
  2. Take out the motor and rotate it 90 degrees, so that the fan motor now blows upward.
  3. Attach the transition piece to connect the oven to ductwork
  4. Modify the cabinet over the stove to allow the duct to pass through by cutting holes on the top and bottom.
  5. Use a laser measuring tool to mark a dot on the ceiling that will identify the center of the hole that needs to be cut for the ductwork.
  6. Join the sections of ductwork and seal the joints with metallic tape to secure them.
  7. In the attic mark a spot directly above the duct so you can cut a hole in the roof decking and extend the vent pipe up through that opening.
  8. On the roof tuck the flange of a roof vent under the shingles above the opening and secure it with roofing tacks and roofing sealant.
  9. To hide the exposed duct in the kitchen, build a frame around it and cover it with cabinet grade plywood. Cover the exposed edges of the plywood with corner trim.
  10. Apply a coat of primer and two coats of the wall paint.

Watch the video for details.


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6 Comments on “How to Vent an Over-the-Range Microwave to the Outside”

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  • Tracy Says:
    November 25th, 2018 at 5:33 pm

    I have an interior wall range with microwave/hood. We wanted to have a replacement microwave/hood dropped lower by 1 1/2 inches and have it vented. Contractor said that venting would have to be through overhead cabinet and run on top of cabinet to external wall with hole punched to exhaust to side. Above the kitchen is a full bath adjoin closet bedroom, so I’m not sure if there is a direct pathway to roof above 2nd floor. Is this a good idea to have vent resting above kitchen cabinets to vent outside?

  • premraj singh Says:
    July 12th, 2018 at 3:52 pm

    i have a microwave like this where can i get the transition piece from ?

  • Raymond Ross Says:
    February 12th, 2018 at 4:53 pm

    I want to replace an old OTR microwave. Due to the kitchen layout the microwave will be installed on an inside wall. I want to vent to the outside. The old microwave did not. It appears when this house was built provision was made for venting out the rear of the microwave into the standard 2×4 wall, up the cavity inside the wall, then up through duct work in the attic through the roof. I would like to use that path to vent a new microwave. My question – given the cavity would be only 3.5 inches deep plus 0.5 inches for the drywall (14. 5 inches stud to stud), will the damper that is attached to back of a typical microwave significantly block the upwards airflow when the fan pushes it open to exhaust the air? We haven’t purchase a new microwave yet so I am unable to see what the overall depth at the damper will be when pushed open. I do not have the option to vent through the cabinet above. Your advice would be appreciated.

  • Ernestine Says:
    September 24th, 2017 at 7:10 pm

    I have this same question – how to install and vent microwave through wall to outside Same question from “Dale”

  • Jeff S Says:
    April 4th, 2017 at 8:20 pm

    Where did you get the ‘transition piece’ is that from manufacturer?

  • Dale Borland Says:
    March 15th, 2017 at 6:15 pm

    Excellent video for through the roof , I need to install through the wall to outside is that video available ?

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How to Vent an Over-the-Range Microwave to the Outside