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7 inch dust collection ducting?

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Forum topic by Jesse posted 12-16-2013 05:04 PM 882 views 0 times favorited 8 replies Add to Favorites Watch
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Jesse

25 posts in 311 days


12-16-2013 05:04 PM

Topic tags/keywords: dust collector grizzly

I recently bought a Grizzly 3HP double canister dust collector for my new wood shop. It turns out that the inlet is 7 inches and I am having a heck of a time finding any piping and fittings that will work with this size of an inlet. I think PVC only comes in 6 or 8 inch and I’m not sure about easily obtained metal duct work? Also, I need to have elbows, straights, and Y type fittings. Of course a lot of my machines have 4 inch ports so I need to be able to reduce at the machine, not sure if metal ducting has options for this?

I found a few places online that want what seem to me to be crazy amounts of money for the fittings so I am wondering what you all use? I really don’t want to take it down to 6 inch unless I have to. I want to do it right (this is my huge dream shop I’m building here) but I don’t want to spend as much on 40 foot of pipe as I did on the machine itself. Any help is appreciated, thanks in advance!


8 replies so far

View Fred Hargis's profile

Fred Hargis

1882 posts in 1179 days


#1 posted 12-16-2013 05:29 PM

Deleted, it was a double post.

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

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Fred Hargis

1882 posts in 1179 days


#2 posted 12-16-2013 05:37 PM

Mine has a 7” inlet, and Oneida suggested I run 7” for at least the first 5-6 feet before transitioning to 6”. So I used 7” HVAC snaplock and 2-7” HVAC el’s to run the duct up to the ceiling, then transitioned to 6” PVC. If you choose snap lock, be sure to get the heaviest gauge you can get; a lot of guys have collapsed the 30 gauge stuff. The transition to PVC is fairly easy to do, though it’s not particularly attractive. A 7×6 HVAC transition (reducer/enlarger) will do it, as for the appearance I’m a function over form guy (really don’t care what it looks like). Here’s what I did to my drum sander to get a 6” port on it. Like I said I function over form, and this works really well.

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

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shipwright

5072 posts in 1483 days


#3 posted 12-16-2013 06:40 PM

This is the second time in a couple of days that I have posted this reference. It is a good solution to the high cost of fittings.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

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descolada

25 posts in 483 days


#4 posted 12-16-2013 10:56 PM

I had the same problem looking for 7” duct in my system recently. If you want to go the sheet metal route (as i did) penn state has pretty reasonably priced. I bought my system using their economy line and it it was a bit of a pain trying to connect everything using duct tape, but worked great once installed. You can find it here: http://www.pennstateind.com/store/economy-ductwork.html

When I went to expand the system I used their economy pieces except i switched in the premium drawband connectors. At 7” they are $20 each instead of $10, but much beefier and easier to install.

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Jim Finn

1699 posts in 1607 days


#5 posted 12-17-2013 03:55 AM

I put in a six inch system all of 24 gage steel. I am a retired sheet metal worker so I made the wyes myself and bought the ells. You could get a sheet metal shop to make a taper for you to fit PVC and use PVC from there to the equipment. It would be one rather expensive fitting but only one.

-- In God We Trust

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copcarcollector

159 posts in 803 days


#6 posted 12-17-2013 05:32 AM

I have that exact dust collector. I ran a small amount of 7 inch metal pipe to turn the corner and go up wall, then used an adapter down to 6 inches for all of the main runs and drops.

View Jesse's profile

Jesse

25 posts in 311 days


#7 posted 12-17-2013 09:14 PM

Having the exact same dust collector, how do you like it so far? I haven’t used mine yet

View Holbs's profile

Holbs

540 posts in 715 days


#8 posted 03-04-2014 02:37 AM

i’m in the process of doing all this myself. gots a blog going with building a Thien Baffle (still in progress).
Everyone that has a grizzly 3HP dual canister says they have 7” inlet. While mine is 6”.
I was lucky.. I have a friend at a HVAC distribution supply house. I get my 6” why’s for $3 and snap lock 5’ for $7 (all 26 gauge).
Was about to fiddle with the wye’s… then I found out they are facing the wrong direction. Unsure what to do about it! Grr…

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