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Project by Jerome posted 12-26-2017 02:07 PM 1508 views 6 times favorited 10 comments Add to Favorites Watch

Hello and thanks for reading and your comments!

This is an air filtration unit that was created by Kevin S. Brady. I downloaded it from his website about 4 years ago. Suddenly, I found myself in “shop improvement mode”. I added 12 20amp outlets, (3 on one breaker for lights) and (2) 220v disconnects to the shop, made a mobile base for my jointer and other things, i digress. Back to this unit. I acquired the attic fans from CL over the years while this was still in procrastination phase. I also had the plywood and leftover electrical supplies on hand. I felt that the design was good, but needed to be stronger, especially at the top. On the wide part of the corners i glued and screwed 2×4 cut offs the sides and from the top so it would not be held together by single strips of wood. This was a perfect time to use leftover paint as it also acts as glue.

Mounting was a big consideration because I am 6’4 and I have limited space, but i wanted there to be enought room for the exhaust. There is about 16 inches from the actual fan blades to the floor above. I’d like more room, but it works. It does however create some sound in the room above.

The wiring can be done many ways. I chose to use a switch then plug it in a ceiling outlet that I had wired. I considered hard-wiring a switch, then using a wi-Fi switch to control the unit via my shop phone. (Old smart phone used for internet radio, web searches, Bluetooth, etc)

He said don’t cheap out on the filters, so I got the $20 ones from HD. I was not excited about spending 80, but I’ll certainly be reusing them! The unit is designed to be a 3000 cfm unit. He goes into detail about this in the plans. Filter sizes are 16×20x1 and 16×25x1 and there are two attic fans wired together in a metal junction box. I have it plugged into a gfci outlet.

One modification that I did not consider until afterwards was that I could have altered the unit by 2 inches, the cfm would not be the same, but I would have 2 more inches of vertical space, or hang it 2 inches lower from the upper level.

This thing really pulls air in! It runs very quiet, like a small desk fan. I have probably only ran it 12 hours and the filters are nice and tan. It is strategically placed near where I do my sanding, the lathe, and scroll saw/bandsaw area. When at the table saw, I have the dust collector going, air unit on, and may possibly get a fan to blow towards the air unit when using the table saw (until I get over arm dust collection)

I have a scanned copy of the pdf. If you would like it, inbox me your email address !

-- Jerome, Marietta, GA

10 comments so far

View GR8HUNTER's profile (online now)


7591 posts in 1493 days

#1 posted 12-26-2017 02:16 PM

a very good homemade unit … it should work very well for you ….GREAT JOB :<))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

View Jerome's profile


161 posts in 2910 days

#2 posted 12-26-2017 02:21 PM

a very good homemade unit … it should work very well for you ….GREAT JOB :<))


Thanks! I definitely feel better sweeping the floor now!

-- Jerome, Marietta, GA

View ralbuck's profile


6547 posts in 3047 days

#3 posted 12-26-2017 07:06 PM

Great project.
The commercial ones are not really great unless you get to the industrial use ones that cost cubic dollars.

-- Wood rescue is good for the environment and me! just rjR

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118066 posts in 4358 days

#4 posted 12-26-2017 07:08 PM

Looks great Jerome,good job.


View  woodshaver Tony C   's profile

woodshaver Tony C

7535 posts in 4134 days

#5 posted 12-26-2017 11:31 PM

Nicely done Jerome! Something everyone need in their shop!

-- St Augustine FL, Experience is the sum of our mistakes!

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7642 posts in 3046 days

#6 posted 12-27-2017 12:30 AM

That’s a genius idea pulling the air in on three sides. Well done there.

View stefang's profile


17039 posts in 4115 days

#7 posted 12-27-2017 12:34 AM

Good idea to take dust extraction seriously Jerome. Your shop-made unit looks great and it should help you to stay healthy.

-- Mike, an American living in Norway.

View Jerome's profile


161 posts in 2910 days

#8 posted 12-27-2017 01:10 AM

That s a genius idea pulling the air in on three sides. Well done there.

- BurlyBob

There are filters on four sides, a fifth filter could be used if someone chose not to mount the junction box on the bottom.

-- Jerome, Marietta, GA

View splintergroup's profile


3804 posts in 2003 days

#9 posted 12-27-2017 02:42 PM

Clever and simple!

If you hang it (versus having it mounted directly to the structure), you’ll really damp out any vibrations to the upstairs (of course your forehead may not agree should the loss of an inch in ceiling height put it in your path 8^)

View Jim Jakosh's profile

Jim Jakosh

24819 posts in 3886 days

#10 posted 01-01-2018 07:49 PM

That is one fine dust control unit! Nice work on it. Good bit of planning went into that project!!

cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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