Tight Space Duct Work (7" Duct For Microwave Venting) - Is This Possible? - HVAC - Page 3 - DIY Chatroom Home Improvement Forum
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Old 05-13-2020, 06:36 PM   #31
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


OK, so it's not pretty but here's what I came up with:



I basically just reused the previous snaplock duct and cut it down several inches little by little then re-fit to the point where I was able to cram it into the adjustable elbow and finally slide it over the boot. I have it in place where I *could* just tape everything. There is a slight bit of overhang where the transition snaplock piece meets the top of the duct boot and a small leakage of air but not significant - am I going to want to address that? Perhaps by cutting a slot to conform that overhang and bend it down to fit against flush against the top side of the duct boot?



The other concern is with the back part of the duct boot:


I think to do it *right* I would unbolt the microwave and tape down the boot in the back - it's really tempting to omit that step though and just cram some tape right down into that "slot" between the back of the duct and the wood strip lol.

Should I just go ahead and tape the snaplock piece to the elbow as-is and also the part where it slips over the boot (so basically the elbow, transition and duct boot are taped together first). Then slowly unbolt the microwave to tilt back and tape all around? Then pop it back into place and get it up to the outlet and be done? Or is there an 'easier' way or order to follow to get to the finish line?

Should I grab some of this stuff to try to fill any gaps where there's air leakage?
https://www.lowes.com/pd/Design-Poly...ealant/3736193
Or is the aluminum foil tape going to be sufficient for all that?
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Last edited by jplee3; 05-13-2020 at 06:50 PM.
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Old 05-13-2020, 10:46 PM   #32
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


It looks like a pretty good fit to me. A couple of wraps of aluminum foil tape, and it should be ready for action.
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Old 05-14-2020, 11:24 AM   #33
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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Originally Posted by HotRodx10 View Post
It looks like a pretty good fit to me. A couple of wraps of aluminum foil tape, and it should be ready for action.

I agree. I'm inclined towards unbolting the MW so I can tape the back part of the duct boot down as much of a PITA as that sounds. But it sounds like I should probably tape the joints/connections I've already made higher up before I do that? Or another idea that crossed my mind is to use a sharpie and mark the positions of the pieces so I know where to adjust them back to once I've taped the boot down.
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Old 05-14-2020, 11:47 AM   #34
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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I'm inclined towards unbolting the MW so I can tape the back part of the duct boot down as much of a PITA as that sounds.

I would try slipping a couple 8" or so pieces of unrolled and uncovered tape down behind the boot and then just pulling them around, before dropping the MW.
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Old 05-14-2020, 11:56 AM   #35
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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Originally Posted by HotRodx10 View Post
I would try slipping a couple 8" or so pieces of unrolled and uncovered tape down behind the boot and then just pulling them around, before dropping the MW.
Good idea - the foil tape has the plastic backing on it to where I could potentially do that then just pull the backing off once I have it positioned I think. Maybe I'll try that to see if I can do it. It'll still be super tight but we'll see....

EDIT: I just tried and I think it's just too tight of a squeeze, unfortunately. Since everything is off at this point I might as well just unbolt it to tilt back and tape. :T

Last edited by jplee3; 05-14-2020 at 12:09 PM.
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Old 05-14-2020, 12:22 PM   #36
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


What worked for me was peeling the backing a little less than halfway, and folding it back, so that I have the bare end of the tape in one hand and the peeled end of the backing and the unpeeled end of the tape in the other. Once it's in position, I can peel the backing the rest of the way, since it's already on the correct side to do it.
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Old 05-14-2020, 12:26 PM   #37
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


Quote:
Originally Posted by HotRodx10 View Post
What worked for me was peeling the backing a little less than halfway, and folding it back, so that I have the bare end of the tape in one hand and the peeled end of the backing and the unpeeled end of the tape in the other. Once it's in position, I can peel the backing the rest of the way, since it's already on the correct side to do it.
Yea, that's what I was trying to do - I was just unable to slide the tape into the crevice at the right angle because it's so close to the wall and also with the supporting cleat almost in the way - it's like an "L"
It would be really hard getting the tape pressed on fully in the back too for the best seal since I have no way to running my finger or anything over the tape to close any gaps, etc.





To get a good connection in the back (when I initially taped it on, I had to get the tape attached to the top back edge of the microwave then onto the damper vent adapter and duct boot (which slips over that piece). If I were to stick the tape down as shown in the pic, it wouldn't really secure the back or close any 'gap'
I guess what I *should* have considered doing was your suggestion of taping half of it down to the upper-back part where I needed to and leaving the plastic peel on the other half and doing this BEFORE putting the microwave up. Then it would have been in place and I wouldn't be in this situation

Anyway, I'm pretty sure I'll need to just unbolt it at this point

Last edited by jplee3; 05-14-2020 at 12:36 PM.
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Old 05-14-2020, 12:31 PM   #38
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


Bummer! Ah well, that's how it goes with projects like this - you always know at the end how you should have done it.
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Old 05-14-2020, 01:29 PM   #39
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


Well, I got it taped and it looks like it's good to go as far as I can tell.

Not super pretty but seems functional LOL:






Quick question though: I noticed at the rotation joints there's a slight 'draft' - am I going to want to tape those joints all around? Or should I just leave those alone?

Last edited by jplee3; 05-14-2020 at 01:32 PM.
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Old 05-14-2020, 01:39 PM   #40
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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Originally Posted by jplee3 View Post
Well, I got it taped and it looks like it's good to go as far as I can tell.

Not super pretty but seems functional LOL:






Quick question though: I noticed at the rotation joints there's a slight 'draft' - am I going to want to tape those joints all around? Or should I just leave those alone?
Tape them too.
It looks great, good job.
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