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Old 02-29-2012, 09:46 PM   #16
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Venting an oven range microwave


Get a 4" angle grinder and a diamond blade---cut the brick---it is a bit of work,but it's the right way--

That machine needs either 6" round or 3 1/4 x 10 to function properly--Post pictures--we will help from our desk chairs.

Right is right--4" is wrong---

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Old 02-29-2012, 11:05 PM   #17
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Venting an oven range microwave


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Get a 4" angle grinder and a diamond blade---cut the brick---it is a bit of work,but it's the right way--

That machine needs either 6" round or 3 1/4 x 10 to function properly--Post pictures--we will help from our desk chairs.

Right is right--4" is wrong---
I am feeling more ambitious so I might give it a go. No angle grinder but I have a decent masonry bit that might help me out. Could I succeed by drilling a few holes around the perimeter of the enlarged 6" space and then chisel?

The thing is, "the man at the big box store" gave me the 3 1/4 x 10 piece, which is rectangular at the opening to attach to the microwave, and then funnels into a round pipe that more or less fits around a 4" . Is this not what a 3 1/4 x 10 is supposed to look like? There were a few different variations depending on what direction you want to take things, my piece turns down immediately and the way I left it last there was just enough room within the wall (i have 4.5inches) to send it back from the microwave, down (I have to send it down my wall a bit because the old hole is too low) and then out the wall. Does any of this make sense?

I'll try to add more pictures tomorrow morning to help clarify. Thanks for the help, you guys are great.
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Old 03-01-2012, 06:54 AM   #18
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Venting an oven range microwave


Look at the 3 1/4" x 10 outside vent covers---it just might be that removing a brick completely might be easier than making a 6" round hole--

Weigh the options before you decide--

And yes--a hammer drill and a masonry bit will get the job done,also.
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Old 03-01-2012, 10:06 AM   #19
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Venting an oven range microwave


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but it will be better than nothing at all.
Not really, because nothing at all is not an option. The vent is designed to flow a certain amount of air. It either pushes that air outside through a proper sized vent or inside through a vent at the top and back into the room. Selecting the outside option then then restricting the flow of air with a undersized vent is not a good idea.

Last edited by mpnret; 03-01-2012 at 06:05 PM.
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Old 03-01-2012, 11:34 AM   #20
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Venting an oven range microwave


ok folks. Here are some photos to help this thread along.

Here's my original hole:

http://www.diychatroom.com/members/d...03-01-11-17-2/

Here's what it looks like after pulling out some of the surrounding insulation. It seems I may already have some wiggle room to add a larger pipe:

http://www.diychatroom.com/members/d...2-03-01-11-18/

Originally, I was going to add something like this:

http://www.diychatroom.com/members/d...2-03-01-11-21/

And then something like this:

http://www.diychatroom.com/members/d...2-03-01-11-22/

Thoughts? Concerns?

P.S. How do I post photos directly in a post? Do I always need to create an album first?
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Old 03-01-2012, 07:37 PM   #21
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Demandrew: see: How to attach a photo to a post
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Old 03-01-2012, 08:05 PM   #22
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Thank you kindly.
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Old 03-01-2012, 08:10 PM   #23
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So there's been a new development.

Thanks to everyone's enthusiasm and encouragement here, I've decided to take the plunge and replace my old 4" round with a new 3 1/4 x 10" exhaust vent. Exciting times.

So now I'm getting ready to convert by 4" or so round hole to the appropriate rectangular hole. Any tips for how to achieve this switch? I'm planning on orienting my new rectangle hole such that the old circle sits in the bottom right corner, or I guess just the right side. I thought I might drill some holes through at the corners of my rectangle, maybe a few more around the perimeter (I'm using a 3/4" bit) and then...and then chisel? Not too sure here. Any tips?
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Old 03-02-2012, 07:24 AM   #24
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Venting an oven range microwave


By the looks of the square to round I think your on to something, the out put of micro wave exhaust fan should flow through that 4" round OK.
If it were mine I would do just what you did without disturbing the outside of the house. If you can line up that 31/4 x 10 with the back of the micro wave exhaust I think you got it made. There are millions of microwaves installed with just a recirculating system that takes no exhaust outside, so you are ahead of the game if you can make that ductwork arraignment work.
Another option is to seal up the exhaust hole before you install the micro wave and just reset the fan to recirculate like many others.

I prefer to exhaust the air. Go for it don't mess with the outside of the house if you don't have to.
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Old 03-02-2012, 07:27 AM   #25
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but it will be better than nothing at all.
I second that, 4"0 will vent fine.
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Old 03-02-2012, 07:36 AM   #26
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Venting an oven range microwave


sorry guys I respectfully disagree....have a good day...
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Old 03-02-2012, 07:45 AM   #27
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Where in the world is reducing a 3 1/4 x 10 down to 4" an acceptable air flow?

Is the inside opened up to expose the framing yet?
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Old 03-02-2012, 08:28 AM   #28
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Where in the world is reducing a 3 1/4 x 10 down to 4" an acceptable air flow?

Is the inside opened up to expose the framing yet?
Yes checkout his pictures, let me check my ductalater.

We're not talking heating and cooling here we're talking just exhausting a little smell and steam from cooking, don't have to maintain temperatures and humidity and how many microwaves are vented with just recirculating rather than exhaust ? They do absolutely nothing.
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Old 03-02-2012, 09:47 AM   #29
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Venting an oven range microwave


I see there's some disagreement here..
Well I'm gonna make a decision soon, but as of last night I was expecting to start breaking more of my wall away to allow for a straight 3 1/4 X 10.

Any tips on the best way to go about this/what's involved so I know better how to weigh my options?
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Old 03-02-2012, 10:16 AM   #30
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Demandrew: Google how to cut a hole in a brick wall on you tube. Lots of videos there; look at a bunch to get the one you like best.
I saw someone on tv cut a hole; they predrilled a circular outline with a drill bit and then used a chisel to connect the dots.
I'm sure there are many ways to do it.

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