Reply by k4zmb

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Posted on Cyclone confusion

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19 posts in 147 days

#1 posted 08-17-2019 11:34 AM

I can t directly answer your question… However, I do have a few questions…

A 4” for your main run is far too small (a statement, not a question). A 6” will provide 36/16 = 2.25x the air flow capacity, and can be supported by a 2hp motor… Delta sold a 1.5hp version, with a 6” inlet, for years, and is probably still doing this – I had one for many years.

My recommendation is to get the specs on both Oneida and Clearvue systems, and reverse engineer what you need. That is, both Oneida and Clearvue sell commercial-grade, well-engineered systems (and they charge you for it). Their specs on cyclone inlet diameter, cyclone length and CFM should be available on their websites or on downloadable documentation – though, Clearvue had horrible documentation, the last time I checked. Delta, Grizzly, and the others in this category may provide specs on their equipment, as well.

For example, the Clearvue system has two impeller options – 15” and 16” (last time I looked), so the housing must be approximately 18” in diameter. The cone is probably 3 long, and tapers to approximately 6”-8”: that is, approximately 18” tapering to 8” over a 3 length – again, this information should be ascertainable from close review of their website/documentation information.

A final recommendation is a 6” main run, with 4” drops to the machines; or if possible, replace the machine connections with 6” orifices; otherwise, the 4” runs will choke the CFM throughput.


Steve, i did get specs from Oneida. I told them that I had 2 hp DC with 4” inlet & they recommended the 4” cyclone.should I remove the 4”Y and use a 5” to 6” reducer, if I can find one, into the impeller housing? Would that improve CFM, but reduce air speed? I take your advice that Oneida has got this figured out, because my small Dust Deputy does a great job with just the shop vac.
I’m just trying to figure out the connections between DD & DC. I plan to keep that connection short & on a mobile stand to get close to each machine to improve collection and decrease air flow resistance. Given that do you suggest using 6” pvc or duct to machine & then reducer to 4” machine port?
Thanks, Marc

-- Marc, “When in doubt, err on the side of caution”

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