Shop made Air Filtration system

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Project by Cruiszr posted 01-22-2014 10:35 PM 6234 views 28 times favorited 8 comments Add to Favorites Watch

This is the air filtration system that I built last year for my workshop. The squirrel cage blower came from a downdraft stove we replaced when remoding our kitchen. Didn’t realize that I would be using it for air filtration when I pulled it from the stove, just knew it would come in handly at some point. Glad I saved it now.

The box is made from 3/4” ply that I had left from another project. Everthing was butt jointed using glue and sheet rock screws. I tried to keep the size as small as I could and still fit the blower motor inside. I ended up using 12×20 filters which kept the heigth of the box to 12 inches. (filters ar not a true 12 inches high.) The length of the box ended up being 24 ” long and the width 22”. The exhaust end of the box was fitted with a 8”x16” heat and air vent. The box is still unfinished but I may eventually get around to painting the box but didn’t seem important at the time.

Currently I have the two speed motor wired for a single speed but plan to change that when I install the additional work light to the bottom of the air box. At that time I plan to put in a a triple gang switch for the two speed motor and the light. I currently turn the filter system on via a remote control that also control dust collection and my shop vac. Will post something on that later.
My total investment in the air filtration system is about $15 for the air vent and filters. Everything else I used was lying around the shop looking for a project, lol

If you have an questions shoot me a line!

-- George R. Forest, Virginia

8 comments so far

View Todd's profile


413 posts in 2240 days

#1 posted 01-23-2014 12:04 AM

I’m going to build one of those when I complete my current project. I like your design: simple and functional. I too have stuff laying around to build it from but I need to find a blower somewhere. Do you have any idea of the CFM?

-- Todd, Huntsville, AL

View Cruiszr's profile


88 posts in 2156 days

#2 posted 01-23-2014 12:45 AM

Not sure about the CFM’s without looking at the blower. As my shop is only 16×20 the unit I’m using should be more than enough considering what it was designed for. I know some people are using blowers out of a junked furnace but they are really big and require a large box. I would try and find a discarded kitchen over head exhaust fan and pull the blower from that. If you want to go the new route a place like Granger’s sells the squirrel cage blower.

-- George R. Forest, Virginia

View Nowater's profile


18 posts in 2504 days

#3 posted 01-23-2014 03:24 AM

Go to your air conditioning or heating man and ask about blowers from air handlers that have been replaced or torn out. I salvaged mine when the AC bit the dust. Just be aware that many of the motors will be wired for 220 volts, so you will need the correct rating on your switches and plugs.

View grumpy749's profile


228 posts in 2941 days

#4 posted 01-23-2014 03:26 AM

Hey George, this looks great. It’s very similar to mine. I used an old furnace blower and filters on both sides with an oak plywood box. To me its the best thing in my shop and I use it often. I find it only needs to run for only a few minutes at a time To filter the entire shop. Check it out on my projects. You will love yours and its the best thing fore your lungs. First class post, looks great, cheep and looks after your health. Denis

-- Denis in Grande Prairie. Yesterday is history, tomorrow is a mistery, but today is a gift. That is why it is called the present.....Pink !

View woodify's profile


334 posts in 2636 days

#5 posted 01-24-2014 02:51 AM

interesting. I’m going to add this to my to built list.

-- Woodify ~~

View sheetzy's profile


169 posts in 2723 days

#6 posted 01-25-2014 10:35 PM

I was considering spending a good bit of money on one. THANX. I just happen to have a blower fan handy….....thanx…....sheetzy

-- What this world needs is a little more sawdust on the floor.

View Cruiszr's profile


88 posts in 2156 days

#7 posted 01-25-2014 11:34 PM

Ha Sheetzy,
Saving money on the air filtration means you can buy another new tool right.

-- George R. Forest, Virginia

View ScammerDoNotInteract's profile


1306 posts in 13 days

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