Homemade Air Cleaner

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Project by Rayne posted 08-27-2014 04:49 AM 3871 views 17 times favorited 11 comments Add to Favorites Watch

I decided to work on cleaning the air in my garage since I don’t have a centralized DC with a good filter. I made 2 of these on each side of the garage facing in the opposite direction, thinking whatever one fan is blowing, the 2nd fan will pull it in and filter it in a cyclone fashion; just on a bigger scale. It was relatively simple to make. It was made from 1/2” MDF, 2 – 20” box fans, dual filter system using a Merv 12 inner filter and a basic external filter. I installed hinges and a clasp so I can remove the filters easily as well as the fan if I ever needed to for some reason. And finally I bought one of those EtekCity remotes and since I had an outlet in the ceiling, this was a perfect solution. I can turn on both fans remotely anytime I want. It’s been about 2 months since I installed these and it’s definitely working as the external filter is definitely getting dirty. The air in my garage doesn’t smell all that musty anymore. I must be doing something right.

11 comments so far

View Billy E's profile

Billy E

162 posts in 3540 days

#1 posted 08-27-2014 11:58 AM

Very good idea. I might need to try something like that. My first thought was wouldn’t it be good to put it on the floor, because dust tends to settle? But then the exhaust might just kick up more dust. There’s probably an ideal location for this. Hanging it up in the air gets it out of the way.

-- Billy, Florence SC

View ChrisK's profile


2076 posts in 4541 days

#2 posted 08-27-2014 12:03 PM

I have been using one of these for years now. Works pretty well. Mostly used when I am sanding. I keep mine portable so I can move it where I am working. Mine does not look as nice, just scrap 3/4 plywood for the box.

Nice work.

-- Chris K

View  woodshaver Tony C   's profile

woodshaver Tony C

8639 posts in 4813 days

#3 posted 08-27-2014 12:03 PM

Good job Rayne, I can say they do help clean the air. I made two of these a while ago one here and one here If you wish to see them.
Nice work clean air it good!

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

View JoeinDE's profile


450 posts in 4783 days

#4 posted 08-27-2014 02:11 PM

I’ve been using one of these for a couple of years now as well, although mine is even simpler. I literally have two 20×20 filters duct taped to the inlet side of the 20” fan with the outer being the cheap disposable one and the inner filter being an expensive (cost as much as the fan) filter. The filter is hung from the I-beam in my basement via two bungee cords so that it hangs above my table saw (which is only stationery power tool that doesn’t have some type of dust removal port).


View fivecodys's profile


1772 posts in 3096 days

#5 posted 08-27-2014 08:16 PM

Great design.
I plan on making one this fall and I really like what you have done.
Thanks for sharing.

-- A bad day woodworking is still better than a good day working.

View MT_Stringer's profile


3183 posts in 4691 days

#6 posted 08-27-2014 09:04 PM

Looks nice. Mine is similar to others. Just one filter with a simple bracket made from scrap cut offs. Mine sits on the table saw, and to any naysayers, I have to say it works just fine. I also have a small Grizzly air filtration unit hanging from the ceiling.

Your fans should provide a lot of dust removal.

-- Handcrafted by Mike Henderson - Channelview, Texas

View Bricofleur's profile


1483 posts in 4653 days

#7 posted 08-27-2014 09:47 PM

This is a winner. I was thinking about building a floor stand for mine but now… I’ll see. Thanks for posting.



-- Learn from yesterday, work today and enjoy success tomorrow. --

View Rayne's profile


1319 posts in 2999 days

#8 posted 08-28-2014 12:03 AM

Thanks for all the comments everyone. What really pushed me to finally make these was actually Tony’s version, so thanks for the push. :) I saw so many other designs and was trying to figure out the best way to go about it and this is what I came up with. I figured hanging on the ceiling was the best way to go about it because if the dust settles, I’m not going to be at the dust level to breathe it in. If it’s floating and is able to get in my nose, these 2 fans are at the right height to pull the airborne particles into them rather than me. If dust gets kicked up again, the fans will take care of it. That’s my logic anyways.

View Rayne's profile


1319 posts in 2999 days

#9 posted 11-21-2014 05:21 AM

First time changing the filters. I’d say it works… :)

View MT_Stringer's profile


3183 posts in 4691 days

#10 posted 11-21-2014 05:12 PM

Yep. It does help a lot.

-- Handcrafted by Mike Henderson - Channelview, Texas

View Roger's profile


21055 posts in 4264 days

#11 posted 01-10-2015 06:23 PM

These box fans work well in my opinion. I’ve had one for years. You just have to keep the filters changed of cleaned every now n then. I still have my 5 buck fan hanging in my shop. It has helped a lot. I also picked up a squirrel cage from Craigs list to make my own shop air filter. One o these days, I hope to get it made…lol

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

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