Venting A Microwave/Range Hood Outside - General DIY Discussions - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > DIY Forum > General DIY Discussions


Thread Tools Display Modes
Old 10-23-2011, 06:32 PM   #1
Join Date: Jul 2011
Posts: 28
Rewards Points: 25

Venting a Microwave/Range Hood Outside

Hey everyone. I received some very helpful advice before from this site and hoping to be so lucky again...

I'm in the process of remodeling the kitchen. My question is in regard to the new microwave/range hood we bought to go over the gas range. We moved the range hood to a new location in the kitchen, so the old air duct which vented outside is no longer in the right place. Basically I'm wondering how to set up a new air duct in the correct location. And how difficult will this be? (I have decent general handyman skills but have never done this specific type of work before) What supplies will I need?

The new location is right up against an exterior wall, so in terms of projects like this, it should be as easy as it gets. I'm guessing it's something along the lines of cutting a hole in the wall with my reciprocating saw, installing a pipe or duct, placing a vent cover on the outside wall, then finally installing the microwave (assuming drywall is back up). The studs of the wall line up about as well as I could hope for; the microwave is 30" wide, the first stud is from 7"-8.5" and second stud is from 23"-24.5" ... so the space between studs is pretty close to the center of the microwave location.

A follow up question is what should I do with the old vent? Would it be okay to just leave it in place and cover it up with drywall?


jmai14 is offline   Reply With Quote
The Following User Says Thank You to jmai14 For This Useful Post:
Lyndanana (06-06-2012)
Old 10-23-2011, 07:13 PM   #2
DIY staff

Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 25,728
Rewards Points: 7,174

If you know the EXACT location of the new micro wave will be --your idea will work---

this is best to do after the cabinets are up or you may locate the opening in the wrong spot.

nice heavy microwave vents are available for 2x4 stud walls.

Before the cabinets go in--check for studs and wires in your way---You may need to 'header in an opening ' to locate the vent where you want it.

Another option is to have the vent go up into the cabinet above---and use a 3 1/4 x 10 addapter to 6" round and exit with a round vent.---This makes a waste of the upper cabinet,however and requires you to make a wood cover to hide the duct work.


New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote
Old 10-24-2011, 07:40 PM   #3
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,893
Rewards Points: 1,092

be careful w/ the cfm on the vent motor. some of these 800+ cfm fans cause negative pressure issues. if your house is super-tight, you may need to install a make-up air vent as well.
jklingel is offline   Reply With Quote
Old 10-29-2011, 02:24 PM   #4
Join Date: Aug 2008
Location: Canada
Posts: 225
Rewards Points: 160

I opened an old vent when installing a new micro/range hood...Then in winter I had a huge ice dam on the roof where the vent was - it created a leak...for some reason I had trouble sealing the outside vent, so I closed it up and switched it to use the internal filter to clean.

I probably use the vent part about 1 time every 10 years, so it made sense to do it this way.
hellothere123 is offline   Reply With Quote
Old 11-01-2011, 05:23 AM   #5
Join Date: Jul 2008
Location: Vienna, VA
Posts: 318
Rewards Points: 276

With the old hole, I would seal it up with expanding spray foam.
sweaty is offline   Reply With Quote
Old 11-01-2011, 06:33 AM   #6
Join Date: Mar 2007
Location: Long Island, NY
Posts: 11,188
Rewards Points: 5,336

The plan you have for the new installation sounds fine.
You didn't mention the electric, so I guess you have that covered.
The old vent hole should be completely closed, both the exterior and the interior. You want to eliminate any openings in the house you don't need.


"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759
Ron6519 is offline   Reply With Quote

kitchen remodel , range hood , ventilation

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Remove and close off old stove hood venting Chickylala Kitchen & Bath Remodeling 1 09-09-2011 01:02 PM
Range Hood venting bket HVAC 4 02-19-2011 07:12 AM
Range Hood Venting Considerations RyanPaq HVAC 0 11-12-2010 02:52 PM
hood venting outside fabian Appliances 2 04-05-2009 08:57 PM
Range Hood venting questions Crashless Remodeling 5 04-13-2008 09:30 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1