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Old 05-12-2020, 01:58 PM   #16
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


Is this an exhaust fan over a kitchen range rather than a microwave exhaust? Is it essentially a range hood?

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Old 05-12-2020, 01:58 PM   #17
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


http://www.southwarkmetal.com/produc...adway-longway/



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Old 05-12-2020, 01:59 PM   #18
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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Is this an exhaust fan over a kitchen range rather than a microwave exhaust? Is it essentially a range hood?

Bud

It's actually an over range microwave exhaust - there was a range hood previously and I removed that to put this over range microwave up.
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Old 05-12-2020, 02:02 PM   #19
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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It may offer a bit more flexibility. But at this rate if I put a step-down adapter from the wall, I think it may come out a bit too far - the duct boot from the microwave is very close to the back wall as it is.
Not if you cut a 6" hole i a 7" plug.
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Old 05-12-2020, 02:02 PM   #20
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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This is a good idea too - just not sure about the dimensions and fit. It may end up going too long. Will have to look at the dimensions on these but it doesn't say the height of the 45-degree one
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Old 05-12-2020, 02:09 PM   #21
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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This is a good idea too - just not sure about the dimensions and fit. It may end up going too long. Will have to look at the dimensions on these but it doesn't say the height of the 45-degree one
You would have to cut the wings off anyway but you could cut it almost anywhere to fit.
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Old 05-12-2020, 02:12 PM   #22
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Quote:
Originally Posted by jplee3 View Post
This is a good idea too - just not sure about the dimensions and fit. It may end up going too long. Will have to look at the dimensions on these but it doesn't say the height of the 45-degree one
You would have to cut the wings off any but you could cut it almost anywhere to fit.

Ahh ok. On that note what would the best type of snips or sheet metal shears be for making these cuts as well as 'standard' sheet metal cuts
like if I just wanted to cut snap lock sheet metal tubing whether straight or angled cuts? Any particular brands or specific snips ? I may stop by Lowe's later to grab a pair.
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Old 05-12-2020, 02:22 PM   #23
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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Ahh ok. On that note what would the best type of snips or sheet metal shears be for making these cuts as well as 'standard' sheet metal cuts
like if I just wanted to cut snap lock sheet metal tubing whether straight or angled cuts? Any particular brands or specific snips ? I may stop by Lowe's later to grab a pair.

You don't want advice from me for that.
You might start another thread with that question.
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Old 05-12-2020, 02:36 PM   #24
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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
Ahh ok. On that note what would the best type of snips or sheet metal shears be for making these cuts as well as 'standard' sheet metal cuts
like if I just wanted to cut snap lock sheet metal tubing whether straight or angled cuts? Any particular brands or specific snips ? I may stop by Lowe's later to grab a pair.
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Old 05-12-2020, 04:55 PM   #25
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


Would a semi-rigid duct be better than the flex, or would it suffer from the same issues?

Last edited by HotRodx10; 05-12-2020 at 04:58 PM.
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Old 05-12-2020, 06:04 PM   #26
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


You'd be surprised what you can make easily yourself out of sheet metal with some snips, sheet metal screws and HVAC tape (the metal kind). What I do is draw the net of the custom object I need on paper and then cut it out. It's really just like what kids learn at school about prisms and cylinders but with metal.

If you have some spare sheet metal give it a go. You are so close to closing the duct, you just need another segment in there.
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Old 05-12-2020, 06:33 PM   #27
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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You'd be surprised what you can make easily yourself out of sheet metal with some snips, sheet metal screws and HVAC tape (the metal kind). What I do is draw the net of the custom object I need on paper and then cut it out. It's really just like what kids learn at school about prisms and cylinders but with metal.

If you have some spare sheet metal give it a go. You are so close to closing the duct, you just need another segment in there.

I plan to pickup some snips. I was actually thinking about just reusing the snaplock tubing that was custom cut for the old range hood and trimming it down, slipping it inside the adjustable elbow, and use that to bridge the gap - this is basically what was done on the range but the taping job was awful. The duct is also filthy with old grease build-up and tape residue - is there a good way to clean those things btw? Soak in hot water and dishsoap? Simple green? GooGone? I applied some GooGone to take off the initial grease...
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Old 05-12-2020, 06:44 PM   #28
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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The duct is also filthy with old grease build-up and tape residue - is there a good way to clean those things btw? Soak in hot water and dishsoap? Simple green? GooGone? I applied some GooGone to take off the initial grease...
If you're ok with nasty chemicals, Acetone or paint thinner will clean pretty much any gunk off metal.
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Old 05-12-2020, 06:58 PM   #29
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The duct is also filthy with old grease build-up and tape residue - is there a good way to clean those things btw? Soak in hot water and dishsoap? Simple green? GooGone? I applied some GooGone to take off the initial grease...
If you're ok with nasty chemicals, Acetone or paint thinner will clean pretty much any gunk off metal.
I have denatured alcohol too. Would that work?
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Old 05-12-2020, 10:20 PM   #30
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Re: Tight space duct work (7" duct for microwave venting) - is this possible?


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I have denatured alcohol too. Would that work?

I ended up filling a 5gal bucket with water and squirting Dawn in and letting these things soak for a good hour, scrubbing them occasionally throughout. I was able to get probably 90% of the gunk off and they look much better. Next part is to go get the aviation shear set from Harbor Freight and cut down the current ducting to size.
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