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Project by MikeDe posted 1275 days ago 2937 views 25 times favorited 19 comments Add to Favorites Watch

This is an inexpensive unit to build and does a good job picking up dust especially sanding dust.
I used 3/4 plywood to build the box and 3/4 oak for the door
I used a felt weather stripping on the door provides an airtight seal
The unit has two filters. The primary filter is a 14×20 furnace filter.
The secondary filter is a “K&N Performance Filter” #33-2035, made for a Corvette,
and can be bought at most auto parts stores.
This one I wash out a few times a year.
I just spray it with any household cleaner like Fantastic and rinse with water
The three-foot long duct on the discharge moves the clean air away from the unit
so as not to pull the same air into it repeatedly, like the store bought cleaners

19 comments so far

View NBeener's profile


4806 posts in 1798 days

#1 posted 1275 days ago

Very slick.
Very nice looking.
Very resourceful, in parts selection.

I’ve had lots of K&N’s. Good product.

Looks like a small block filter, right ? Maybe 427cid, but NOT a 454 ;-)

Do you know the HP and or the CFM of the motor you used ?

-- -- Neil

View BTKS's profile


1967 posts in 2089 days

#2 posted 1275 days ago

Absolutely ingenious, I love the exhaust duct and incorporating the car parts.

-- "Man's ingenuity has outrun his intelligence" (Joseph Wood Krutch)

View DIYaholic's profile (online now)


13249 posts in 1299 days

#3 posted 1275 days ago

Very nice unit.
I’m in the process of designing/setting up my shop (tool/machine placement, DC ducting, lighting/electical). All this includes building my own air cleaner. Seeing your work inspires me to attempt to build one of nearly equivalent quality, not just a “functional” unit. Thanks for sharing your project.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View steliart's profile


1807 posts in 1313 days

#4 posted 1275 days ago

great idea and very nice construction

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions - --

View Splinterman's profile


23058 posts in 1986 days

#5 posted 1275 days ago

Hey Mike,
Sweet unit, functional, healthy and cheap….well done.

View BigTiny's profile


1664 posts in 1513 days

#6 posted 1275 days ago

I love the idea of using the duct to keep from recycling the same air time after time. I’ll bet most of us are filing this under “Why didn’t I think of that?”

-- The nicer the nice, the higher the price!

View Mojo1's profile


145 posts in 1315 days

#7 posted 1275 days ago

very nice

View Big_Bob's profile


164 posts in 2333 days

#8 posted 1275 days ago

I do have a question what did you use for a fan motor?

-- Bob Clark, Tool Collector and Sawdust Maker

View KMT's profile


591 posts in 1287 days

#9 posted 1275 days ago

Thanks for sharing this one. Its a great idea using a washable K&N filter. I second Bobs question. Whats in it for a fan and motor?

-- - Martin

View peteg's profile


2856 posts in 1447 days

#10 posted 1275 days ago

I too am interested in the drive gear :) looks a good job

-- Pete G: If you always do what you always did you'll always get what you always got

View SgtSnafu's profile


957 posts in 1896 days

#11 posted 1274 days ago

I like the idea of the added duct keeping the clean air circulating..

Thanks for sharing

-- Scotty - aka... SgtSnafu - Randleman NC

View JOEY B's profile


65 posts in 1312 days

#12 posted 1274 days ago

Nice work . I built a 3’ x 6’ filter box on my central heat and air inlet . it works great.

-- Tools tools and more tools its funny when we go in a store for anything we always look at the tools

View Dusty56's profile


11643 posts in 2312 days

#13 posted 1274 days ago

”so as not to pull the same air into it repeatedly, like the store bought cleaners”
Nice idea , but my air cleaners are three feet long and suck the dust in one end and exhaust the filtered air out the other end , and they’re store bought and it’s virtually impossible to recirculate the same air with the velocity created by them.
I’ve yet to see any “store bought” units that are built square in the first place , and / or exhaust anywhere near the intake area.
Yours looks like a nice unit for being homemade …what fan and motor are you using in it ? : )

-- I'm absolutely positive that I couldn't be more uncertain!

View GrumpaJeff's profile


30 posts in 1316 days

#14 posted 1274 days ago

Nice design and looks fairly easy to do. Could you add some info on the fan/blower unit?

View Rob Vicelli's profile

Rob Vicelli

96 posts in 1316 days

#15 posted 1274 days ago

I would also like to know the fan inside…..Nice design though

-- Rob V

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