Air filtration device? - Woodworking Talk - Woodworkers Forum
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post #1 of 16 Old 01-22-2020, 08:04 PM Thread Starter
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Air filtration device?

I'm looking for recommendations for a ceiling-mounted air filtration device for use in my shop, which is really just a standard two-car garage with 10-foot ceilings. Many years ago, I researched this issue and settled on a model that had washable filters so I could save money on replacements, but I sold it after moving, and evidently it is no longer available. It has been so long since I last looked into this issue that I don't remember how many cubic feet per minute I need it to have or which brands and models perform well. TIA for your advice.
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post #2 of 16 Old 01-22-2020, 08:27 PM
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Box fan and a washable furnace filter or pleated paper filter. Wife saw this on HGTV. Surprising how much dust it removes in a couple of hours.
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post #3 of 16 Old 01-23-2020, 12:36 AM
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I know of Jet, WEN, and Powermatic at least that make such fans, probably others as well. My sense is Jet is the most popular, just from the number of times I see it mentioned. I Have the Jet AFS-1000B.

On air flow, you want this fan to be able to cycle your shop several times an hour. So do the math, you'll end up needing around 1500-2000cfm to meet that. Be aware they will all have variable speeds, and the CFM rating is of the fan blower itself, when on max speed, and with no filter(s) installed. And also keep in mind that this fan in no way replaces dust collection from tools. At best it augments the air quality of the particles that don't get picked up from your dust collector.
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post #4 of 16 Old 01-23-2020, 08:34 PM
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There's been several YouTubers that compared 20" box fan conversions to store bought ceiling cleaners and they all seem to say a box fan moves more air therefore does a better job.


Here's one link:


You can skip to about 5:20 if you don't want to watch the whole thing.

.
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post #5 of 16 Old 01-24-2020, 09:15 AM
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I've posted this before but every time this subject comes up I'll probably post these photos again 'cause it's still working just fine. I have a total of $30 in this box fan, aluminum channel, and filter. I clean the filter as needed but generally about once each month and then I change the filter a couple of times each year. I mounted the fan upside down so I can reach the switch so no remote needed. As you can see, I can swivel the entire unit if it's blowing in a direction I don't want it to or vice versa.

Every morning about 5:45 when I walk in the shop I turn the fan on and it runs all day until I shut the shop down around 9 each night. Sometimes I turn the filter to where the pleats run horizontal, sometime vertical; I can't really tell if it makes any difference.

Air filtration device?-shop-air-cleaner-1.jpg

Air filtration device?-shop-air-cleaner-2.jpg

Air filtration device?-shop-air-cleaner-working.jpg

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Last edited by difalkner; 01-24-2020 at 09:17 AM.
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post #6 of 16 Old 01-24-2020, 11:25 AM
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I've posted this before but every time this subject comes up I'll probably post these photos again 'cause it's still working just fine. I have a total of $30 in this box fan, aluminum channel, and filter. snip...

David
And I'm glad you did. That is the simplest box fan filtration build I've ever seen. I've checked out a hand full of box fan builds and a lot of them are major projects, many with pre and post filters, custom fan shrouds, sealed enclosures, and so on.


But yours gave me inspiration. From what I can tell, you just screwed the channel right onto the fan, yes? Have any build photos? I think I'm going to have to make one.
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post #7 of 16 Old 01-24-2020, 11:50 AM
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Glad you like it - it works well!

This is the only photo I have from when I built it -
Air filtration device?-shop-air-cleaner-parts.jpg

I took the filter out to get a few shots for you -

Everything is mounted to the boards -
Air filtration device?-shop-air-cleaner-mounting.jpg

Air filtration device?-shop-air-cleaner-mounting-2.jpg

Here's the best shot I could get of the swivel -
Air filtration device?-shop-air-cleaner-swivel.jpg

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post #8 of 16 Old 01-24-2020, 12:01 PM
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what more effective for workshop, make dust collector system or make Air filtration. if make both i have problem with electrycity coz not enough power both that. i more choose air filteration coz not difficult like dust collector system.
That good choose or not?
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post #9 of 16 Old 01-24-2020, 03:02 PM
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Originally Posted by plywoodworking View Post
what more effective for workshop, make dust collector system or make Air filtration. if make both i have problem with electrycity coz not enough power both that. i more choose air filteration coz not difficult like dust collector system.
That good choose or not?
Dust collectors and air filtration systems serve two different purposes, ideally you need both, one to collect the dust and contain it directly from the machine and one to clean the air that has particles of dust floating in it.

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post #10 of 16 Old 01-24-2020, 03:28 PM
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Dust collectors and air filtration systems serve two different purposes, ideally you need both, one to collect the dust and contain it directly from the machine and one to clean the air that has particles of dust floating in it.
yes i know about that, but i make both my problem on electrucity power, so many consume power if use both.
maybe i will make air filteration first for know after i upgrade electrycity hope i can both on my workshop.
i really like use router that why so many dust
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post #11 of 16 Old 01-25-2020, 11:28 AM
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Glad you like it - it works well!

This is the only photo I have from when I built it -
...
I took the filter out to get a few shots for you -
...
Everything is mounted to the boards -
...
Here's the best shot I could get of the swivel -
..
David
Thanks for the additional photos; very helpful. It's the season around here where they start taking the heaters off the shelves and start putting fans in their place. I'll be keeping my eyes open for a 20" box fan.
.
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post #12 of 16 Old 01-26-2020, 11:34 PM
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Interesting discussion. Thank you for posting. On the box fan design, does the filter go on the input side where air enters the fan or the output side? Does it matter?

Thanks,
Rob

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post #13 of 16 Old 01-27-2020, 11:18 AM
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Interesting discussion. Thank you for posting. On the box fan design, does the filter go on the input side where air enters the fan or the output side? Does it matter?

Thanks,
Rob

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The main filter(s) go on the Ďiní side. Air flow is smoother and less dust accumulates on the motor. Putting the filter on the Ďoutí side causes more turbulence in the fan box and can hurt air flow.

Some folks use a two filter Ďiní system where the first filter is cheaper one to collect bigger stuff, and the second one (closest to the blades) is a higher quality (higher MERV rating) to stop the finer dust.


Others use high quality 'in' filters in both slots and when the first one get full, they pull it out, put the second one in its place, and a new filter in the now empty slot closest to the blades.


Some folks even also use one on the outside in conjunction but I donít see any real advantage in that.

.
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post #14 of 16 Old 01-27-2020, 12:36 PM
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IMO a bonafide air filtration unit will outperform a box fan.

I have a Jet and it works great (can't remember model).

Robert
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post #15 of 16 Old 01-27-2020, 01:05 PM
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My filter is on the 'in' flow side for the reasons mentioned above. And I use the cheap air filters; they seem to do just fine. There's virtually no dust in the shop and the fan runs all day long. Of course, I catch as much dust as possible at the source using the Wynn 0.5 micron filter and that really helps.

Yes, I don't doubt your Jet unit works well, Robert, but for only $30 I'll take my box fan and be happy with it.

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post #16 of 16 Old 01-27-2020, 11:16 PM
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I was amazed to find out just how well my fan/filter works. The darker circle that you see in the picture lines up with the fan blades (you can see the lower corner of the filter is lighter), and is paint that was in the air from my using spray cans 20 feet away from the fan!
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