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Forum topic by Rhaugs posted 06-03-2019 10:19 PM 490 views 0 times favorited 22 replies Add to Favorites Watch
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Rhaugs

17 posts in 188 days


06-03-2019 10:19 PM

Hi guys,
I’m getting into my new shop shortly (22×18) garage, and wanting to pipe in my DC the right way! I have a HF 2HP motor, on top of a SDD (5”, not 6”). I’m wondering if I can use a 6-5 reducer, in reverse, to make it a 6” system for running PVC throughout. I know Oneida says not to do this (make the system bigger than the inlet on the SDD), but curious if anyone has.

If this doesn’t work, I’m guessing my options are to use galvanised 5” duct or come out does right away 5”-4” and use 4” PVC instead of the 6.


22 replies so far

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ibewjon

679 posts in 3211 days


#1 posted 06-04-2019 12:00 AM

I would go with the 5” heavy guage steel and long radius 90’s. I did and my system works great. Also 2 hp. Wood magazine had a DC piping article a while back, and recommended 5”, 4” too small and 6” to big. But the 5” is just right. I bought the long radius 90’s, but got a spot welder from harbor freight and fab my own Y fittings. Really pretty easy to do.

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Bob5103

138 posts in 1252 days


#2 posted 06-04-2019 12:38 AM

When I set up my HF DC I compared a 6” vs 5” duct, using my handheld anemometer. The cfm was considerably higher with the 5”. I don’t remember the exact numbers, but it was at least 200 CFM more than the 6”. I went with 5” ducts.

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Rhaugs

17 posts in 188 days


#3 posted 06-04-2019 12:40 AM



When I set up my HF DC I compared a 6” vs 5” duct, using my handheld anemometer. The cfm was considerably higher with the 5”. I don t remember the exact numbers, but it was at least 200 CFM more than the 6”. I went with 5” ducts.

- Bob5103

Did you just use regular HVAC galvanised from a big box store?

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Rhaugs

17 posts in 188 days


#4 posted 06-04-2019 02:14 AM



I would go with the 5” heavy guage steel and long radius 90 s. I did and my system works great. Also 2 hp. Wood magazine had a DC piping article a while back, and recommended 5”, 4” too small and 6” to big. But the 5” is just right. I bought the long radius 90 s, but got a spot welder from harbor freight and fab my own Y fittings. Really pretty easy to do.

- ibewjon

Were you able to purchase at a Lowe’s/HD store? Was it the HVAC steel?

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ibewjon

679 posts in 3211 days


#5 posted 06-04-2019 02:22 AM

I believe what you need is 26 guage, the duct at the big boxes is usually 30 guage or thinner. 30 will collapse under suction. It can be purchased from a heating supply, either locally or online. Use brush on duct sealer down the length wise joint. I then use aluminium tape on joints between sections. The sealer is also painted on the y’s I made. This is a picture of some of the y’s I made.

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ibewjon

679 posts in 3211 days


#6 posted 06-04-2019 02:27 AM

The long radius 90’s were purchased from Oneida, or any supplier you choose. But definitely the long radius type.

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ibewjon

679 posts in 3211 days


#7 posted 06-04-2019 03:06 AM

I found the 5”, 26 guage at sim supply for $6.90, for 24” length. I bought it for less locally in Illinois.

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clagwell

29 posts in 211 days


#8 posted 06-04-2019 10:39 AM

deleted

-- Dave, Tippecanoe County, IN

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MikeDilday

258 posts in 877 days


#9 posted 06-04-2019 01:38 PM

Go with dust collection metal pipe. HVAC pipe has joints in the wrong direction. Rockler has a good selection of 20-24 ga steel – not sure how the price compares. Go with 5” mains and 4” drops. Put mains in the ceiling and drops down the walls. use a wye for each drop horizontal towards the wall then 90 down the wall – this is important so chips don’t fall into the drops.

-- Michael Dilday, Suffolk, Va.

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Robert

3436 posts in 1899 days


#10 posted 06-04-2019 01:42 PM

The short answer is YES YOU CAN.

I did exactly the same thing and it works fine. 6” mains and drops with a reducer to 4” and flex to machines.

PVC will work just fine you do not need metal ducts.

Use 2- 45’s to make a 90 the 6” 90 sweep are quite pricey.

-- Everything is a prototype thats why its one of a kind!!

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ibewjon

679 posts in 3211 days


#11 posted 06-04-2019 01:52 PM

Just turn heavy guage hvac pipe around and the joints go the right direction. As long as the pipe goes into the pipe coming from the collector like a funnel. And PVC pipe can build up a static charge and can not be grounded because it is not a conductor.

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ibewjon

679 posts in 3211 days


#12 posted 06-04-2019 02:17 PM

What hp DC are you using with 6” pipe? There needs to be the proper blend of volume and velocity. Too large of pipe increases the volume and lowers the velocity below what is needed for good chip and dust collection.

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Rhaugs

17 posts in 188 days


#13 posted 06-04-2019 06:01 PM



What hp DC are you using with 6” pipe? There needs to be the proper blend of volume and velocity. Too large of pipe increases the volume and lowers the velocity below what is needed for good chip and dust collection.

- ibewjon

I have a 2hp motor. It sounds like I’ll stick with metal pipes. Will check out what rockler and woodcraft offer before going to Oneida. Thanks guys.

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ibewjon

679 posts in 3211 days


#14 posted 06-04-2019 06:11 PM

From the little I could see on the pentz site, 5” is the limit with a 2 HP. That is what I have. You should be able to get the straight pipe locally from a heating supply. I only got 90’s from Oneida. I can try to post pictures of my patterns if you want to make your own Y’s. A spot welder is less than $150, and it really doesn’t take long once you do one. Unless you don’t need many y’s, then buy them.

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Rhaugs

17 posts in 188 days


#15 posted 06-04-2019 06:14 PM



From the little I could see on the pentz site, 5” is the limit with a 2 HP. That is what I have. You should be able to get the straight pipe locally from a heating supply. I only got 90 s from Oneida. I can try to post pictures of my patterns if you want to make your own Y s. A spot welder is less than $150, and it really doesn t take long once you do one. Unless you don t need many y s, then buy them.

- ibewjon

I think I only need 4, I will plan to buy them for now. Thanks for all the help!

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