Air filtration Box

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Project by David65 posted 08-03-2009 12:32 AM 2927 views 5 times favorited 12 comments Add to Favorites Watch

After a much needed thought process and hunt for supplies I finally built my air cleaner filter box measuring 20”x40”x24”. The wood is 3/4” beach wood the fan is a (3) three speed evaporator fan motor. I was pretty lucky in acquiring my parts the evaporator fan was given to me by a co-worker and the beach plywood was given to me by a general contractor. The only thing I had to purchase was a wire connector $1.45 the rest of the electrical I had in stock lying around the shop. The air filters I have a box of for my house A/C they are 20”x20”x4”. In the picture you can see me standing underneath it just to show the height clearance. The switch is up hi on the side out of easy reach but ingenuity kicked in and I made an extension handle to turn it on and off. I don’t know the CFM but I can see the effect of the air flow on low I haven’t tried the hi speed yet but maybe one day.

-- David '65

12 comments so far

View a1Jim's profile


117689 posts in 4028 days

#1 posted 08-03-2009 12:36 AM

Way to go David
Cool filter box and nice shop too. well done

View David65's profile


190 posts in 3736 days

#2 posted 08-03-2009 12:39 AM

Thanks Jim.

-- David '65

View dustyal's profile


1310 posts in 3926 days

#3 posted 08-03-2009 12:56 AM

Super duper air mover and cleaner… I need to do something similar in my very small sawdust room. I’m thinking duct tape 20” filter to a 20” box fan ought to do it. You guys have to get fancy and put us to shame. Well done. But, didn’t you for forget the stain and finish? A little molding around the the inlet/outlets? lol…

BTW: I assume the filters on on the inlet air flow side?

-- Al H. - small shop, small projects...

View Innovator's profile


3589 posts in 3864 days

#4 posted 08-03-2009 01:52 AM

Congtrats, this is a well needed tool for any shop. My Jet works overtime to keep the shop clean.

-- Whether You Think You Can or You Think You Can't, YOU ARE RIGHT!!!

View moshel's profile


865 posts in 4135 days

#5 posted 08-03-2009 03:01 AM

just finishing making my own. they have huge effect, especially when you sand and just blow off dust from surfaces. unfortunately blowers are not very common here (read: non existents) so I had to get a plate fan.

even before finishing the enclosure I couldn’t wait and run it while blowing the layers of dust that has accumulated on the shelves. the filter went dark after 1h and the air was very clear.

well done!

-- The woods are lovely, dark and deep, but I have promises to keep...

View bmturner24's profile


14 posts in 3675 days

#6 posted 08-03-2009 06:35 AM

This project is right on time! I have a squirrel fan from my old furnace sitting in my shop waiting for me to make it a home. Your photos should get me in the right neighborhood! Thanks

View Don K.'s profile

Don K.

1075 posts in 3777 days

#7 posted 08-03-2009 06:45 AM

Great looking air filter. I went by my local heat and air place a while back to ask if they had any extra….they had a stack of them…told me to take my pick for free.

-- Don S.E. OK

View ChuckM's profile


625 posts in 4117 days

#8 posted 08-03-2009 08:39 PM

Looks to be a powerful system. My shop-made filtration system doesn’t get used during summer time because I work with the garage door open. In the winter time (easily – 10 to – 15 C cold), I work with a portable propane tank heater with the door closed and that’s when I turn on my air cleaner. can’t tell from your photos – are you using more than one layer of air filters? I followed the design recommended in some articles: 1 on the intake side and two on the outtake.

-- The time I enjoy wasting is not time wasted

View SCOTSMAN's profile


5849 posts in 4036 days

#9 posted 08-03-2009 10:14 PM

Wow a clever design I am designing a similar one myself with 2 squirrel fans and a couple of truck circular air filters. I will get it done soon I promise. PS I love yours and glad to see you did your own thing very sucessfully by all accounts rather than purchasing one from off the shelf Kindest regards .Alistair

-- excuse my typing as I have a form of parkinsons disease

View David65's profile


190 posts in 3736 days

#10 posted 08-04-2009 04:16 AM

Chuck, what I used on the intake was two (2) 4”thick x 20”wide & 20” tall pleated box filters this gives me more surface cleaning on the filtration with the same static pressure inside the box not to put strain on the motor.

Alistair, thank you the end cost was only a couple of bucks the motor and plywood was given to me so the only thing I actually purchased was a wire connector I didn’t have in the shop. So purchasing one for $300 – $400 hum lets see…

-- David '65

View HD_woodchuck's profile


39 posts in 3738 days

#11 posted 08-06-2009 03:20 PM

I built one years ago for my then large shop. I was back to my home town a few weeks ago, and pulled mine out of storage, wanting to bring it to my new shop, but I couldn’t fit it in the car with the luggage and family.

SWMBO told me I couldn’t leave our daughter behind, even if I wanted the air filter!!!

Anyway, just as a note, since the air unit is always mounted up high, I placed my switch on the bottom of the unit, easily reachable from the floor, even for a short dude like me.

Oh and my creation is certainly not as nice as yours … great job!

Just a last question … how are the filters secured in the box? I can’t see anything holding them in place in the pics.

View David65's profile


190 posts in 3736 days

#12 posted 08-07-2009 02:49 AM

Well since wood sounds weird I’ll say Chuck, the filters are 4” thick so there is nothing holding them in no need for anything. I thought long (about 2 seconds) about something then I forgot what I was thinking about (not) it just doesn’t need anything. If I ever go to a smaller size filter I guess will haft to come up with something.

-- David '65

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