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How To Install A Vented Microwave Oven

How To Install A Vented Microwave Oven Under A Cabinet

Today’s task was to install a microwave oven under the cabinets and to install a through the side wall vent.    Most of the manufacturer instructions detail specifically how to install a vented microwave oven so make sure to read these instructions and to purchase all of the duct work needed to complete the project before you start.

Microwave Power Cord:

You will need an electrical outlet.  Most folks locate the outlet inside the cabinet above, out of view.

Microwave Mounting Options:

Manufacturers usually require the microwaves to be hung from a cabinet above or to mount to the wall with a mounting bracket.  sometimes this mounting bracket is an accessory so figure out how you will be mounting the unit when purchasing it.

All microwaves come with templates that help you locate your holes either above in the cabinet or on the wall.   If you do mount to the wall it is important to attach your fasteners to at least one wall stud.  Use toggle bolts when wall studs are not available.

Microwave Venting Options:

Microwave ovens vent three ways.    Exterior venting models require you to adapt to the following three types of ventilation:

  1. Outside Top Exhaust (Vertical Duct)
  2. Outside Back Exhaust (Horizontal Duct)
  3. Recirculating (Non-Vented Ductless

Most cabinets spaces above a stove are 30″ wide and you need to make sure that this space is free from obstructions.  If the space between the cabinets is greater than 30′′ yo may need to add filler pieces.  All kitchen cabinet supplier offer Filler Panel Kits for this purpose.

Venting To The Outside:

If you are going to vent your microwave oven to the outside you will need to install an exhaust duct with a vent hood.   Most  hood exhausts has been designed to mate with standard 3 1⁄4′′x 10′′rectangular duct.

If a round duct is required, a rectangular-to-round transition adapter must be used.  Note – Do not use less than a 6′′diameter duct as velocity will be restricted.

Preparing the Vent Hole In Wall:

Photo of unit installed – it was heavy and bulky.

Finished view from the inside. Looks easy!

Outside view before we started. The hole in the upper right is the old vent hole, which needed to be  patched.
New vent and clapboards installed.  We installed a flat board cut out to accept the vent  This mounting board makes for a cleaner siding installation and allows flashing to be installed.
Finished view.
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