Dust Collection Accessories (Tubing/Ducting/Blast Gates)

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Forum topic by bobkberg posted 02-18-2010 08:06 AM 1371 views 0 times favorited 2 replies Add to Favorites Watch
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420 posts in 2491 days

02-18-2010 08:06 AM

I have a delta 1HP dust collector, but I’m using that flexible 4” plastic duct with the Y’s and such and plastic blast gates.
Before anyone asks – it’s all grounded with copper wire everywhere – not my question

I’ve noticed that the blast gates seem to leak a lot, and I’m also wondering if the corrugations on the inside of the tubing are causing any turbulence problems and affecting the air/dust flow noticeably. Now that I’m working steadily again, I’d like to think about upgrading to all smooth metal, but I’d like to get some of your experiences in terms of quality of materials, effectiveness of flow, blast gates that don’t leak, etc.

Especially in the case of my table saw, which is on a mobile base, I’d like a better grade of tubing that doesn’t get crunched when I push it back to the wall when not using it.


-- Bob - A sideline, not how I earn a living

2 replies so far

View b2rtch's profile


4821 posts in 2466 days

#1 posted 02-18-2010 01:43 PM

Yes, the corrugations cause a lot of turbulence and turbulence in turn create pressure drop ( less flow)
If you are in a permanent shop , use smooth tubing such as PVC or ABS, you will gain quite a bit and you can make a “cleaner” installation.
Avoid sharp 90 degrees or Tee fittings use long sanitary fittings instead,they give a smoother flow, in addition they do not get plugged so easily.

-- Bert

View Steve Peterson's profile

Steve Peterson

317 posts in 2500 days

#2 posted 02-18-2010 06:55 PM

Many web sites indicate that flex tubing has approximately 3X the resistance as smooth pipe. So 10 feet of 4” flex tubing has the same resistance as 30 feet of 4” pipe.

I suspect that it might even be more than 3X worse, since 4” flex tubing has a 4” wire diameter with the plastic walls falling to the inside by maybe 1/4”. 4” flex tubing ends up with an effective diameter of around 3.5”.

I agree that it is best to route most of the length in smooth tubing and only use flex tubing where really need it.

-- Steve

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