Hooking up 2 dust collectors: series, parallel or waste of time?

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Forum topic by Sark posted 06-14-2017 03:02 PM 3428 views 0 times favorited 5 replies Add to Favorites Watch
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268 posts in 1127 days

06-14-2017 03:02 PM

Topic tags/keywords: dust dust collector dust collection ducting

As a result of a quick Craigslist purchase, I now own 2 dust collectors: 2 HP grizzly and 1 HP UFO. I’m getting ready to put in a decent dust collection system. There are 3 ways to use these 2 collectors:

1. Series or tandem: where the 1 hp feeds into the 2 hp (or Vice versa). This theoretically would increase static pressure.

2. Parallel: Both dust collectors connect into a single larger duct. This theoretically would increase the CFM of the system.

3. Don’t use: Since the dust collectors are mismatched, the small one might impede the flow of the large one, reducing any possible advantage. In parallel, the overall CFM would increase. It would be a pain to do the extra duct work in either case, and cost more money for fittings.

Why do I want to do this? Trying to make best use of equipment that I already own. In my old shop, we used the ClearVue cyclone with 6” ducting everywhere. But now I’m back to the old garage, and dust collection is the highest priority for shop improvement.

Thanks for your thoughts.

5 replies so far

View papadan's profile


3584 posts in 4135 days

#1 posted 06-14-2017 03:05 PM

Use the grizzly and just sell the other one and use the money to buy duct for your system.

View Fred Hargis's profile

Fred Hargis

6230 posts in 3260 days

#2 posted 06-14-2017 03:49 PM

Use the grizzly and just sell the other one and use the money to buy duct for your system.

- papadan

^^^^^ Yep. This question comes up about once a year (although it’s usually a matched pair of HF DCs). But I’ve yet to go back and see someone explain what a great idea is was. I think Stumpy Nubs did that (with the HF units), you might check his stuff and see what happened, but I don’t recall him saying it was a great idea either (I could be wrong).

-- Our village hasn't lost it's idiot, he was elected to congress.

View jonah's profile


2119 posts in 4065 days

#3 posted 06-14-2017 04:06 PM

1) No, it won’t work.

2) No, it won’t work.

3) Yes.

You are always, always better off with one big motor and one big impeller.

View TungOil's profile


1381 posts in 1262 days

#4 posted 06-14-2017 04:29 PM

Don’t try to mix two DCs into the same system. Either use the larger one, or if you have room you could effectively create two systems by collecting some tools that are close together into one DC then the rest into the other DC. You might save on some pipe but it will cost you in floor space.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View Holbs's profile


2335 posts in 2796 days

#5 posted 06-14-2017 05:41 PM

I say keep the #2 dust collector which is the…1 HP UFO. Handy for mobility. I have a 3HP Grizzly that is stationary… and I just picked up a 1HP Delta I plan to use on a cart…think of a super shop vac. Or can be used on a downdraft table… or…. finishing ventilation… or to tackle a machine that is 20’ or further away from your main 2HP dust collector. Can use the #2 DC for lots of good uses. Granted, I paid $10 for the 1HP Delta though.

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

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