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Confused about Dust Collection

79421 Views 70 Replies 28 Participants Last post by farmfromkansas, Sep 2, 2019

DavidNJ

Discussion Starter · Dec 23, 2012 (Edited by Moderator)

I'm getting very confused about the dust collection options. I've seen 1 hp wall mounted units, units with a big filter on top and bag on bottom in sizes from 1hp to 10+hp, units with cyclonic action before the filter and bag, shop vacs which seem to have as much power but much less airflow, and cyclonic add on's to shop vacs.Then there are supplementary filtering units and all of the units come in different specifications from 1 micron to 30 micron with 2-2.5 micron seeming most common. However, those measurements don't give percentages or how they decay over time.

Prices are also over the place. Shop vacs from under $100 to over $600. Top filter units from $250 to thousands. Cyclonic units seem to start at $800 with Jet having some add-on that they claim does a similar function in the same price range.

I'll need to handle one tool at a time. The tools will include a table saw (probably 3hp cabinet but possibly 1.75hp contractor), router table, miter saw, jig saw, handheld router, belt/disc sander, and, maybe circular saw.

What do you recommend? Will a shop vac with Oneida Dust Deputy cyclone be sufficient? Is an air filter needed in addition to the dust extractor?

The workshop is in the basement.

Thanks,

David

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knotscott

· #17 · Dec 24, 2012 (Edited by Moderator)

Impeller size is a large factor in real world air flow, measured as CFM. Many of the CFM ratings should be taken lightly, as they're often measured in ways that don't represent a real world load, or are simply heavily over stated. I'd go with something at least as capable as the HF "2hp" unit. Most of the 1hp units with 9" or smaller impellers don't quite make the grade. The HF DC has a 10-3/4" impeller, a motor closer to 1.5hp, and is capable of something closer to 600-800 CFM….it's recommended that you upgrade the bags to a cannister type filter with a smaller micron rating. The step up to something like a Penn, Grizzly, Jet, Delta, or JDS will likely run at least twice as much as the HF, but will have 12" to 13" impellers and will draw close to their stated CFM ratings.

Here's a pic that shows the difference between a 10-3/4" impeller and a 13" impeller:

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