jussi Posted December 23, 2017 Report Share Posted December 23, 2017 I'm hoping to finally install my cyclone early next year and was wondering what kind of ducting you guys use. I currently have 4" SD for my Delta dc but want to step it up to a 6" metal ducting when I put in the cyclone. It's a 3hp Oneida. Nordfab would be the ideal choice but too expensive for me. What other options do you suggest looking into? Thanks Quote Link to comment Share on other sites More sharing options...
mat60 Posted December 23, 2017 Report Share Posted December 23, 2017 I use PVC pipe because its not very expensive at all... The Nordfab stuff would be great. Quote Link to comment Share on other sites More sharing options...
ChrisG-Canada Posted December 23, 2017 Report Share Posted December 23, 2017 I have an Oneida V-3000 (3HP). I found a local(ish) supplier and got galvanized spiral wound round ducting. Available in many sizes and also got the elbows, tees, reducers, etc. from them. It’s not Nordfab so I connected each piece with short self-tapping screws (type used for wood stove vent piping) and then wrapped each seam with aluminum foil tape (not plastic or even cloth duct tape). I also took the time to use silicone caulking to make sure all the joints in fittings were air tight. According to a smoke test everything is sealed up and the system works great plus I have no concerns about accidentally collapsing any of the ducting. 1 Quote Link to comment Share on other sites More sharing options...
pkinneb Posted December 23, 2017 Report Share Posted December 23, 2017 I have had a Oneida Super dust Gorilla for over 10 years and used standard pipe (and design) from them. Its not spiral or norfab and has worked without issue for me. Quote Link to comment Share on other sites More sharing options...
mat60 Posted December 23, 2017 Report Share Posted December 23, 2017 Wouldn't the spiral ducting slow down air flow a little? Quote Link to comment Share on other sites More sharing options...
Chet Posted December 23, 2017 Report Share Posted December 23, 2017 25 minutes ago, mat60 said: Wouldn't the spiral ducting slow down air flow a little? I think that what Chris is referring to is on the outside of the pipe. 1 Quote Link to comment Share on other sites More sharing options...
Chestnut Posted December 23, 2017 Report Share Posted December 23, 2017 1 hour ago, mat60 said: Wouldn't the spiral ducting slow down air flow a little? There is actually some supporting evidence that creating a spiral motion inside a fluid pipe increases the flow due to cutting down turbulent flow. I don't know how much this would work for dust collection systems but think riffle barrel not flex pipe. 2 hours ago, jussi said: I'm hoping to finally install my cyclone early next year and was wondering what kind of ducting you guys use. I currently have 4" SD for my Delta dc but want to step it up to a 6" metal ducting when I put in the cyclone. It's a 3hp Oneida. Nordfab would be the ideal choice but too expensive for me. What other options do you suggest looking into? Thanks I recently did DWV PVC and it wasn't what i'd call cheap but it was easy. I think in my thread about my shop i compared the price of PVC to the cheapest metal ducting i could find. My shop sits around 20% RH and i don't notice any static what so ever open blast gates or on the surface of the pipe. There is also enough supporting evidence out there that states the bit of static that does build up does not create any sort of fire issue. 1 Quote Link to comment Share on other sites More sharing options...
drzaius Posted December 23, 2017 Report Share Posted December 23, 2017 2 hours ago, mat60 said: Wouldn't the spiral ducting slow down air flow a little? There is a type of spiral duct that has pronounced ridges & is made that way for strength. It is not recommended for high velocity use such as dust collection. 1 Quote Link to comment Share on other sites More sharing options...
..Kev Posted December 23, 2017 Report Share Posted December 23, 2017 Just my 2 worth.. Nordfab is worth the cost. Perhaps use inexpensive PVC and replace with the Nordfab one drop at a time as the money is available. Quote Link to comment Share on other sites More sharing options...
Keggers Posted December 23, 2017 Report Share Posted December 23, 2017 I was going to suggest using Nordfab until you said it was too expensive. If you can find the $$$ you'll be glad you bought it. Quote Link to comment Share on other sites More sharing options...
BillyJack Posted December 24, 2017 Report Share Posted December 24, 2017 PVC is fine. Use pvc at home and all metal at work...Too easy on a budget.... Quote Link to comment Share on other sites More sharing options...
jussi Posted December 24, 2017 Author Report Share Posted December 24, 2017 Thanks for the suggestions guys. As I said I would love nordfab but I just can't justify the cost. I still regret not jumping a deal on craigslist last year. I like the idea of using a local place. I will do some research and see what I can find. On that note, if anyone in the Los Angeles or OC area knows of such a place please post here or PM me. Thanks Quote Link to comment Share on other sites More sharing options...
drzaius Posted December 24, 2017 Report Share Posted December 24, 2017 It's not the end of the world if you can't justify the cost of Nordfab. For a small fraction of the cost of Nordfab, I installed 26 Ga spiral duct with long radius elbows. At each fitting you just have to drive 3 sheet metal screws (which takes all of about 15 seconds) instead of snapping the Nordfab seal tight. Then seal the joints with aluminum duct tape or brush on duct sealant, either of which are quick & easy. A crimping tool is good to have. If you plan on changing out your layout frequently, the Nordfab would be nice to have, but again, it's not hard to do with standard duct either. Quote Link to comment Share on other sites More sharing options...
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