Yet another dust collector question...

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Forum topic by Jim Dawson posted 04-25-2016 01:23 PM 666 views 0 times favorited 2 replies Add to Favorites Watch
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Jim Dawson

114 posts in 1031 days

04-25-2016 01:23 PM

I just received my Grizzly hanging air filter today but being new to dust collection, I don’t know where to put it. I have a HF dust collector but still get a tremendous amount of fine dust over everything, especially when using MDF.

Should I mount the filter near the dust collector or the center of the shop? The shop is 24×24 but shared with two motorcycles.

Thanks for any suggestions,

2 replies so far

View crank49's profile


4032 posts in 3170 days

#1 posted 04-25-2016 01:43 PM

An air filter will be most effective if it can circulate air around the room. So, in the center of one side, near the wall would be best. If that location is such that a major source of fine dust, like a sanding station, is near the intake so much the better. Bottom line is to do what you can to keep the air moving in a big circle with the filter directly in the path of that flow. The center of the room would be the least effective spot and a corner would be almost as bad.
Any air handling device, either a fan, a collector or a filter, can blow air much farther than it can pull it. About 27 times as far to be exact. Don’t have time to explain that here, but it is directly from the “Manual of Ventilation, Accepted Practices”. A reference book highly valued by many experts in the field of industrial ventilation. Here is a link if you want to wade into it:,d.eWE

View clin's profile


954 posts in 1195 days

#2 posted 04-25-2016 02:32 PM

I question the common suggestion to locate the unit near one wall to improve circulation. I see no reason one large circular path is better than two smaller paths.

As mentioned, the momentum of the blown air carries it much further. I do think it is helpful if the intake side is closer to one end of the room. I’ve heard to place these about 1/3 the length in the room with the intake to the short side.

The idea is to constrict the intake side somewhat in an effort to keep a higher airspeed.

My experience is the most useful thing is to have the air intake as near the dust source as possible. Intake air speeds are quit low just a few feet from the intake. Dust will drop out of the air pretty quick once the airspeed drops.

I had tried having the unit blow towards the dust source. Thinking this might ensure the dust gets kicked up into the air and carried around to the intake. But I believe much of the dust settled out before it could make it around to the intake. I turned my unit around which resulted in the intake drawing air right above my table saw. This works much better.

In the end I think these units do a good job of keeping the air clean while they are running. But I’m not sure they extract a large amount of the total dust. The remainder settling out of the air and accumulating, and easily kicked up by moving around the shop. I.E. They are most effective if you really run them anytime you’re in the shop, not just when making dust.

Note: I have a Dylos particle counter I’ve used to get an idea how this fine dust behaves and is affected by my Jet room filter.

-- Clin

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