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Project Information

Hey guys,

So I am between jobs right now so I thought I'd knock out some of those projects in the back of my head. One of those projects was a shop filter made from a box fan and plywood scraps.

I saw a thread the other day about shop filters. I have always thought a shop filter would be nice to have, but I wouldn't want to blow a bunch of money on one. So, like many of y'all, I decided to build my own. I made it out of some scrap plywood I had sitting around. I made the box so that the filters and fan can be removed from the side. Some wooden tabs hold a removable side piece on, and when you need to change the filter or use the fan, you just remove the side piece and take out whatever you want. I included in the box 2 places for 1" thick filters, 1 place for a 5" filter, and a place for the fan.

Photo 1: Completed filter hanging over the tablesaw
Photo 2: Filter box with removable side sitting next to it
Photo 3: Filter box with a filter and fan inside
Photo 4: Different view of filter box with filter and fan inside

I hope to keep at least two 1" filters in it most times. I made the spot for the 5" filter so that one day I can put a 20"x20"x5" MERV 16 filter (which catches 99% of .3 to 1 micron dust) in it. Those filters alone are about $100, but one per year isn't too bad. I am hoping that a "sacrificial" 1" filter in front of it will help get most of the big stuff and prolong the life of the fancy filter.

I built this project because I felt that it could do almost as good of a job as a fancy rig with a few cheap filters. With the MERV 16 filter in it, it will outperform $700 machines. Hope you guys like it.

Here is a link to the MERV 16 Filter I was looking at:

"http://www.amazon.com/Lennox-X7935-MERV-16-Filter/dp/B004X4UOW8/ref=sr15?ie=UTF8&qid=1391582490&sr=8-5&keywords=lennox+merv+16+filter"

Gallery

Comments

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Your box filter will perform just as good as the expensive ones with the same filters in it. I bought mine and added a pre filter in front of the two it came with to catch the big stuff first . Works great and doesn't interfere with the cfm. Yours is a great version of those. Nice build. Well done.
 

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Nice work, had one of these for a long time…. Enjoy…
 

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can you give us a feel for the improvement it has made in air quality? I keep considering making my own, but I am not convinced the smaller fans can move enough air to be effective.
 

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Nothing like having clean air in the shop. I made one with the same fan but with one filter for inside the house. I find that the fan does slow down quite a bit with just having a single filler. You can see my fan filter here.
I also tried the using the same pleated filter as I see in you photos and it slowed the fan down a bit more.
I made one for my daughter's bird room and that fan does collect most of the floating bird dander in the room.
 

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Eztrigger, I will let you know how it changes the environment in the shop. I'll need a few weeks to get a good feel for it, but I'll try to remember to put the results on the project comments. Also, looks like you might be the second aggie I have encountered on here is the last week. Gig em!
 

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Everyone should consider having an air filter in their shop.
I think the squirrel cage blowers do a better job of moving the air than a box fan. Many people (including myself) have gotten them from old house furnace blowers. Some even have multiple speeds.
I built mine into a floor cabinet with wheels so I can move it closer to the source of dust when necessary. The top serves as a sharpening station. Most of the time it is also used to circulate the heat from my wood stove.
 

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Yeah, I would like to have a squirrel cage type one day, but the fan was nice and convenient (and free), so I went with that.
 

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Looks pretty handy to me! Well done…
 

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Very Nice Project Indeed! Beautiful Work! Thanks For Posting!

Rick
 

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I like it.
At first I thought you had left a space for a second box fan to help increase air flow. Of course as I read your text I now understand what the space is for.
Nicely done!

Bill
 

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Real good idea. I made mine from an old hot air furnace blower. I put in two regular furnace filters. It was mounted right over the table saw for three years. I was satisfied with it until I saw the manual for a store bought one. Thay recommended mounting it near a wall so you get a circulating effect. I did this and the difference was dramatic.
 

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+1 LesB I just got two and am making a box for the crawlspace as well as one for a friend. Free is always good and they are throwing them away 4-5 at a time.
 

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Nice workmanship, before you spend money on a Merv 16, I'd recommend you check out the static pressure drop that it takes for that fan to work. I have a similar home built in my workshop drawing that uses a discarded inline fan. I'm only using Merv 8's at this time. See my workshop picture if you are interested I can give you more information.
 

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nice build!

I need to put one of these together for my shop ASAP!

It was touched on earlier in the comments, Can you use 2 box fans (maybe with a filter between the 2)?
 

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Now that using two fans has been mentioned, I bet I could do that. Sort of like a turbocharger for a shop fan! I will definitely give that a shot if I notice that decreased air movement becomes an issue. Thanks for the idea guys!
 

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Nice job on your project. Get a remote for it. :)

Mine is simply a fan with a filter attached with duct tape. You can tell it works because the filter will get dirty from collecting the dust. I also have a small Grizzly that works well also.
 

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I do like it. It's very cool. Now I know what to do with my old box fan now that I'm moving more into the central valley of California into a house with HVAC.
 

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Stupid question time…..does the fan pull the air thru the filters, or does it push the air?
 

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can i use allergy type filters to go hand in hand with 5" filter? i have high allergies to environment in my house, this includes my hubby working projects throughout the house, i'm so sensitive to everything i am fed up with. got any idea i can put these together??
 

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You can use as many filters as you like, but the more you add, the more resistance to airflow you'll get. At some point it defeats the purpose. you would need a pretty strong fan to pull air through a 5" thick air filter. I doubt the box fan in this if you are looking for different filter options, try green screen, they come as pre-cut foam so you can have them made for any installation and they have been quite effective at cleaning the air in our home. I also use a UV light on my AC evaporator coils. the UV doesn't help for dust, but it kills molds and other living irritants.

https://greenscreenairfilter.com/
 
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