Dust Collection #2: 3-Stage Dust Collector Filter Box

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Blog entry by ThomasLightle posted 01-16-2016 02:52 AM 1108 reads 1 time favorited 2 comments Add to Favorites Watch
« Part 1: Modified Harbor Freight Dust Collector Part 2 of Dust Collection series Part 3: Simple, Cheap, and Easy Blast Gates »

After modifying my Harbor Freight dust collector, I needed a filter for the discharge of the blower. The dust collector mod did a great job eliminating a majority of the dust, but it was still discharging fine dust into my workspace – something I didn’t want to be breathing. This time I drew up a plan in Sketchup and used it to guide me in this build. The build was rather straightforward, and a made small changes here and there where it made sense.
I call it a 3-stage filter because the first chamber acts as a baffle to slow the velocity of the air down, then it passes through a 5-micron prefilter and finally through an allergen reducing furnace filter. The box is so efficient, that I haven’t seen any dust on the furnace filter yet, so I am pretty satisfied with the outcome. I hope you enjoy the video.

3-Stage Filter Box

-- Thom

2 comments so far

View shipwright's profile


7082 posts in 2216 days

#1 posted 01-16-2016 03:55 AM

I am curious to know if you noticed any reduction in air flow volume as you have actually reduced the area of filter medium from the original bag. The usual filter modification, to a canister filter, dramatically increases the area and increases the air flow very noticably.
It seems like you are happy with yours and that it works but I have to ask as the filter area seems to me to be very small.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

View ThomasLightle's profile


56 posts in 313 days

#2 posted 01-16-2016 10:03 PM

You make a good point. I’ll have to rig something up to compare suction with unimpeded flow vs. with the filters installed. I think I reduced the filter surface area by 1/3, but It doesn’t seem to have affected performance. I’ll update if I get around to testing it.

-- Thom

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