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Old 10-05-2013, 04:57 AM   #1
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how to vent to outside


I have a 30" cabinet under which a OTR microwave is going to go.The microwave vents up into the cabinet and I need to join the exhaust vent to the existing vent pipe in the ceiling. The exhaust vent to the roof is in the soffit towards the right of the cabinet. Its a square shape vent which is about 5x5 inches. The vent hole to the roof actually overlaps the edge of two adjacent wall cabinets.

I am having a very hard time bending a vent pipe to fit it around the vent hole. I have uploaded some pics of my situation. I have tried all the suggestions given by home depot but nothing has worked

Please take look and give me some urgent advice.

http://flic.kr/s/aHsjKekzF1

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Old 10-05-2013, 06:52 AM   #2
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how to vent to outside


Is there access to the top of the soffit?

I would move the duct work to the center of the cabinet top---

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Old 10-05-2013, 03:13 PM   #3
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how to vent to outside


There is access to soffit through attic but the duct is solid alluminium and goes straight up to the roof. If I have to move it without changing the roof opening location I will need to bend it which I feel will be even more complicated.

Any other options ?
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Old 10-06-2013, 11:38 AM   #4
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how to vent to outside


are you having a hard time getting the pipe in place ?
or
getting the round pipe to fit the square pipe ?
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Old 10-06-2013, 12:03 PM   #5
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how to vent to outside


How about constructing your own duct out of some 3/4" mdf?
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how to vent to outside-duct.jpg  
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Old 10-06-2013, 01:09 PM   #6
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how to vent to outside


With difficulty I am able to connect a 6" duct pipe to the microwave adapter....but my biggest challenge is how to connect it to the vent in the soffit.

The vent is square, its broken on some sides and its not centered above the hole and with such a small space I am not able to bend the pipe to go over it. Even if I did I wouldn't know how to connect them. I have tried all the 45 degree 90 degree adapters, flexible and semi-flexible pipes etc but I am not able to make the connection happen.

please help.

How do you make your own duct with mdf ? Is that an approved material to use for venting ?
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Old 10-06-2013, 01:14 PM   #7
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how to vent to outside


This may be a dumb question, but it that an outside wall?
just in case it is...

Our micro is on an outside wall so
we vented it straight out the wall behind the micro.
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Old 10-06-2013, 01:21 PM   #8
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how to vent to outside


I would go to a real HVAC/Plumbing supply to see if they have a 5X5 sheet metal adaptor that would fit. If you can't locate the correct product, take detailed measurements and go to a sheet metal shop and have them fabricate what you need.

BTW, MDF is not the correct material to construct a vent for this application.
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Old 10-06-2013, 05:08 PM   #9
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how to vent to outside


The garage is on the other side of the wall. The vent goes straight up and into the attic and then vents out at the roof.

I will try to find a HVAC/Plumbing supply store but I was hoping to do DIY this.
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Old 10-06-2013, 05:23 PM   #10
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how to vent to outside


Well, you'll be DIYing it...just with the right parts !

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