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Forum topic by gmaffPappy posted 03-14-2019 09:01 PM 200 views 0 times favorited 7 replies Add to Favorites Watch
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gmaffPappy

28 posts in 2328 days


03-14-2019 09:01 PM

I’m all ready. I have all the parts, screws, bolt, nuts, boards, ducts, sealers, blower, cyclone…etc. I’m ready to build the wall mount this weekend.

Once last question, again on the exhaust.

The outlet on the blower is 5”. My plan was to fit it to an 8” duct to the outside with a louvered cover. The reason for the duct size is that in the future, if I want to upgrade to a Clearvue or a larger blower, I’m all set. Makes sense at first. Then I put together what it takes to get from 5” – 8”, and that’s a lot of duct work…over 2’ to be more precise.

Of course I’m much rather not lose 2’ of potential cabinet space, but that’s not my main concern. Noise is!

Should I just keep the exhaust at 5” and rotate the blower so that the exhaust points right out the wall, knowing I’ll eventually have to enlarge the hole to 8” for an upgraded blower? My thinking is that, since most of the noise comes from the exhaust, it’s best to pipe it straight out, with as little ductwork as possible, and deal with the exterior noise with a muffler box. If I keep the +2’ of duct on the inside of the workshop, it will just be a loud resonating steel tube next to my working area keeping the noise indoors. There should be no performance degradation from NOT enlarging the exhaust.

Is this a correct assessment?

-- If it's easy to do, you haven't spent enough time over engineering it.


7 replies so far

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fivecodys

1367 posts in 1933 days


#1 posted 03-14-2019 11:20 PM

Here is what I did.

I went from a 5” exhaust and went up to a 6” using HVAC Duct work & fittings. Way cheaper than the good stuff I got from Oneida.
I had the garage door track to navigate around and I used 5” adjustable elbows (3) to do it.
I routed the exhaust down to the same height as our Dryer exhaust. I gave serious thought about exiting under neath the eve of the house but the wife veto’d that idea.
It looks just like another dryer vent when you see it from the outside.
I taped all the seams shortly after this picture was taken.
It exits the Shop/Garage via a 6” Dryer duct. I am also looking for a way to quieten the exhaust noise.

If you come up with a good solution, I would be grateful if you would share it with us.

-- When you leave your shop for the night, make sure you can always count to 10.

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tynewman

15 posts in 9 days


#2 posted 03-14-2019 11:39 PM

I would turn the blower so it goes straight out. Less pipe the better. That is what I plan on doing. I have the blower on top of the cyclone now and then over to the bag and filter it came with. The shop is brand new and I haven’t been able to bring myself cut a hole in the wall yet. but I’m going to any day now.

-- Ty

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gmaffPappy

28 posts in 2328 days


#3 posted 03-15-2019 02:17 AM

fivecodys – I was thinking the same them with location. I could even hide it low behind the bushes. But then I remembered that for some reason, in my neighborhood, most of the dryer exhausts are piped between the 1st floor ceiling and second floor. I know it’s kind of weird, but that’s where they are. So, I shouldn’t have a problem venting directly out from the high mounted blower.

I talked to Oneida about sound muffling. They suggested creating a box on the outside of the house. The box should be just big enough to have sound insulation lined walls and contain a flex hose the size of you exhaust. The hose should snake left to right several times. Each change in direction absorbs more noise. Finally, they suggested pointing the final exhaust exit downwards to direct the remaining sound towards the ground.

That’s what I think I’ll do,, if the neighbors complain….and I care. It also seems to jive with the other suggestions for exterior sound mufflers I’ve read about on the forum.

Of course, those who have actually done it are welcome to sound off. I love to have ideas shredded. It keeps me from wasting time making dumb/ineffective things.

-- If it's easy to do, you haven't spent enough time over engineering it.

View Fred Hargis's profile (online now)

Fred Hargis

5370 posts in 2790 days


#4 posted 03-15-2019 12:15 PM

Why not put the 8” hole int he wall, and then cut a wooden donut to fit inside it…then a 5” hole for the current ducting?

-- Our village hasn't lost it's idiot, he was elected to congress.

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gmaffPappy

28 posts in 2328 days


#5 posted 03-15-2019 12:35 PM

Best idea yet. I love it. 5” directly out to a finished exterior 8” port that has a donut reducer down to 5”. That will work. Short run, less noise, setup for upgrade, Perfect! Thanks!

-- If it's easy to do, you haven't spent enough time over engineering it.

View fivecodys's profile

fivecodys

1367 posts in 1933 days


#6 posted 03-15-2019 04:28 PM



I talked to Oneida about sound muffling. They suggested creating a box on the outside of the house. The box should be just big enough to have sound insulation lined walls and contain a flex hose the size of you exhaust. The hose should snake left to right several times. Each change in direction absorbs more noise. Finally, they suggested pointing the final exhaust exit downwards to direct the remaining sound towards the ground.

I will have to give this some thought. I would have to do all of this on the inside as my vent is seen as you walk up to the front porch. A big box in the flowerbed would surely bring the wrath of the wife down upon me. Right now my system enjoys very little resistance on the exhaust side due to the absence of a filter. The “Snaking” of a vent hose would cause more resistance but how much and to what effect will require more investigation. Thank you for the idea. I like it and I have the space for it.
You gave me a lot to think about.

-- When you leave your shop for the night, make sure you can always count to 10.

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gmaffPappy

28 posts in 2328 days


#7 posted 03-15-2019 04:58 PM

Plan on making mine about 24”x24”x9”. I think that should be accommodate four turns of an 5” flex hose. I’ll cover it with the same siding that’s on the house and tucked under the eave. Should be pretty innocuous.

-- If it's easy to do, you haven't spent enough time over engineering it.

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