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Hi there. Here is my take on workshop air quality problem. I tended to ignore it until recently, when I purchased Dylos Air Quality Monitor. It is counter of particles in the air, calibrated to count particles of two sizes, especially hazardous for health, and allows to continuously monitor air quality.

Not only did it confirm that my air becomes dusty after sanding, cutting, sawing, but also showed how bad it gets sometimes. The next logical step for me was building an air filtering system. As constant noise could become an issue in itself, I realized that the largest-diameter fan produces the highest flow on lower RPM, which translates to lower frequency noise that is easier to tolerate.

Combining this square 20-inch fan with 20" HEPA filter (by just leaning filter on the fan and seeing it getting sucked onto the grid) instantly showed very promising results - the pollution level dropped 100 times faster than without any filtering, and this particular fan is very quiet even on high speed. So my next project was to build a casing for fan and filter, and put it in some place in the workshop where it is out of the way.

The box is built out of .75" birch plywood, pocket screw joinery. I didn't have to disassemble the fan or even remove its feet - it would be easy to take it out if needed. It is also easy to replace filter - they both are held in place by two eccentric latches pushing them against narrow fences around perimeter. The box is hanging from the ceiling on plastic chains capable of holding 50lb weight - above my height, I won't be able to bump my head. The controls are facing down, so I can turn it on and adjust speed without a problem.

I added a handle on a side in case I will ever have to move it around. There is also a little shelf for air monitor, and power outlet to power it. Finished building it today and already enjoying it - fan is out of the way, I keep it constantly on, and it doesn't take precious power outlet to run - I am using the one on the ceiling. Overall, it cost me about $50 in parts and materials (not counting air monitor).

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I have used one of these for a few years now, works pretty well.

Yours looks nicer than mine.

Nice work.
 

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You've inspired me to build one. I've been thinking about it for a while but just haven't got around to it. And I was really curious to how well they worked. Thanks for the info!
 

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A few years back I built something similar to yours and it's amazing just how much saw dust you can clean out of the air. Your going to be very pleased with yours. It's a very nice build.
 

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This type of filter system has been shown a number of times and is quite effective.
I made mine 20 years ago from a used HVAC (house furnace) squirrel cage type blower. I got my blower when I replaced my heating system but a local heating contractor will probably give one to you if you ask. It is very quiet and moves a lot of air. In addition it does double duty by circulating the heat from my wood stove. Built into a floor cabinet with wheels the top also serves as my sharpening station.
 

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"Air purifier out of 10" fan"

Confusing to say the least.
 

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Could he have made a typo error 10 instead of 20? To me this looks like a 20" box fan- nice job.
 

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Yes! You made it to #1. As Stumpy Nubs says, " You deserved it my friend"
 

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Indeed, it s 20" fan, fixed the title :)

- BOBAH
Thanks. Now I realize I have a similar set up, just not as fancy as yours. It sets on the table saw fence supports to help capture dust from above the saw. Works well. I keep a couple of spare filters for it and vacuum it often. Note I also have a Grizzly air purifier that is hanging from the ceiling over the work bench.




 

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In addition to my Delta Dust Collector, I hung a similar 20" box fan with a filter from the ceiling above the left side of my radial arm saw. The dust collector does not get all of the finite particles of dust that float into the air and the fan/filter help pick up some of the missed dust.
 

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Nice to see I'm not the only one to think of this.
Nice mount for your setup.
 
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