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Dust Collection Duct Design

by Joel J
posted 02-09-2018 02:26 AM

5 replies so far

View John_'s profile


251 posts in 2583 days

#1 posted 02-09-2018 08:18 AM

I bought one of those ‘Y’s along with a couple of aluminum blast gates and some other fittings from Woodcraft last week – they are having a 25% off sale right now

I never wanted to get into having a ‘permanent’ type setup with trunk lines running everywhere – instead, I use a single 5” flex hose to connect to my combination machine (jointer/planer/shaper/table saw) which really simplifies things. Recently I got a great deal on some more 5” flex hose from Amazon Warehouse so I decided to add a second 5” flex hose – which is why I bought those parts from Woodcraft

I just finished installing it a couple of days ago, so I don’t have a lot of use with it yet, but so far it has worked out great. I have a single piece of 5” metal duct coming off the dust collector and the end of the 5” Woodcraft Y slipped snugly inside. I also wanted to add two blast gates at the Y – which is when I started to run into problems.

The outside diameter of the end of the Y are about the same diameter as the blast gate so you need some sort of union/coupler. Probably most people would use flex hose or whatever. I wanted something a little more rigid and would not take up a lot of space, so I grabbed my heat gun and with a little patience I was able to heat up the ends of the Y so that they became soft enough that I could force the fitting on the blast gate inside. I then screwed the two parts together with self tapping screws and it feels real solid.

Another problem crept up was I wanted to use a ‘quick connect’ type fitting directly to the blast gate because I don’t always have a hose connected. But, the standard 5” quick connect type fittings I also bought, were a little too big. I was able to work around it by using 4” rubber Fernco connectors (about $7 each on Amazon). So one end of the Fernco goes over the blastgate fitting and is held in place with a worm clamp and the quick connect fitting then goes over the rubber end of the Fernco for a pretty tight friction fit.

So in this pic you can see the Fernco on the upper blast gate (they come with worm clamps) and on the lower blast gate I have my 5” flex hose with the Woodcraft 162288 quick connect coupler attached to the other Fernco

Woodcraft also has a 5” to 4” connector if you wanted to do something similar with your 4” hose (162287)

View d38's profile


142 posts in 1140 days

#2 posted 02-09-2018 02:14 PM

Since spiral pipe is expensive, look at heavier gauge snaplock.
For my Grizzly 2 hp, I used 26 ga Greenseam brand thru Grainger. They also have 24 ga. Purchased in boxes of 5 pieces. It has a neoprene-type of product in the snap and on the tube ends for better seal, but other than that, its snaplock. If you can pickup at a store, its very reasonably priced.

I got my saddles and elbows from Air Handling Systems, in their “hobby” product line.
Good prices, but shipping is pretty high – call for a shipping quote. They’re very helpful.

I used Menards band clamps to connect a lot of it. Great for connecting 2 male fittings. Its nothing more than sheet metal with hose clamp ends riveted to it. Add some sheet metal screws like John posted above, and you’re set.

Duct is a jigsaw puzzle to figure out a good design, but in the end, you’ll enjoy it

View Joel J's profile

Joel J

59 posts in 2817 days

#3 posted 02-09-2018 11:29 PM

Thanks guys….some great ideas there. I guess I’ll just need to get back on that jigsaw puzzle!

-- Joel, Denver, CO

View Holbs's profile


2366 posts in 2907 days

#4 posted 02-10-2018 01:56 AM

are 5” wye’s more spendy than 6” wye’s? If I remember right, my 6” metal duct wye’s were around the $12 at a local HVAC distributor with 26 gauge. They were about the same at HD but 28 or some 30 gauge.
I did buy ALOT of 26 gauge HVAC ducting for my shop but also some trashed 6” green PVC SWD pipe that easily molds after heat gun treatment.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View Rayne's profile


1315 posts in 2417 days

#5 posted 02-10-2018 02:49 AM

are 5” wye s more spendy than 6” wye s? If I remember right, my 6” metal duct wye s were around the $12 at a local HVAC distributor with 26 gauge. They were about the same at HD but 28 or some 30 gauge.
I did buy ALOT of 26 gauge HVAC ducting for my shop but also some trashed 6” green PVC SWD pipe that easily molds after heat gun treatment.

- Holbs

Yes, they are. I’m thinking they’re not used very often, so not widely made. I hunted all over the place for a 5” wye and ended up spending about $30/ea from a store in Texas when I was setting up mine. I found 5” T’s on the cheap, but that would have killed my CFM.

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