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Offline Dawg25385

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Workshop Air Filtration
« on: January 04, 2017, 12:52:14 AM »
Figured this counts as tools...

So after spending a day in the shop building things, cutting plywood, 2x's, etc... i realized things got really dusty really fast. On my chop saw, i can rig up the shop vac, but circular saw... no dice.

So i want to design an air filtration system, using the same size furnace filters from the house. So when it's time to swap out the ones in the house, they will be then 'shop-worthy'. I think i'm going to first do a simple box, suspended from the ceiling, and then ultimately do a ducted system where the fan and filters are up in the attic to cut down on sound, and also get rid of the big box hanging from the ceiling.

Now the question i'm trying to solve at this point, is what to use as the fan. So far, i really like what the inline cetrifugal fans have to offer. They're mainly used and marketed for indoor grow operations, but hey, they move air.

Would like to get about 1000cfm, but there's a nice little blower that's 750cfm for $80 on amazon. Has 8" inlet/outlet, which seems like a hefty amount of volume.

https://www.amazon.com/gp/product/B019J979MY/ref=ox_sc_sfl_title_4?ie=UTF8&psc=1&smid=A18TGAB2SJ5GBJ

Would wire into a timer, 120v

Obviously, this is not a replacement for a 'dust control' system, a la central vac, which at some point down the road i will do. But for now, clearing up the air seems like something that will help the ole lungs in the meantime.

Have any of you guys done something like this? Lots of videos on youtube of people using furnace blowers, but i haven't found any cheap, and i do like the idea of round inlet and outlet so i could use circular ducting down the road when i tuck it up into the attic.
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Offline stlaser

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Re: Workshop Air Filtration
« Reply #1 on: January 04, 2017, 08:44:58 AM »
Only experience I have are with the portable (on wheels) Miller and Lincoln smoke eaters and they flat out work.......

They were several K though but had nice flexible ducting you could put right over where you were welding. Craftsman several years ago used to make a tube system for a shop that hung from the ceiling.

Edit: kinda looked like this but red in color



https://www.amazon.com/Shop-Vac-1030000-Cleaner-Filtration-System/dp/B00004T181
« Last Edit: January 04, 2017, 08:47:52 AM by stlaser »
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Offline Flyin6

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Re: Workshop Air Filtration
« Reply #2 on: January 04, 2017, 12:47:54 PM »
Building your own is super easy.

Purchase a box fan

Build a plywood enclosure around it. Cut slors in the side for either a 20 X 20 or a 25 X 25 filter. Set 2-3 with space in-between them in the enclosure. Suspend it from the ceiling with a couple small chains.

Place scented oil or whatever between the filters

Turn it on

Forget about it
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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #3 on: January 04, 2017, 01:15:12 PM »
20x20 is what the house uses so I'll definitely be doing that... but I think I want a beefier fan than a box fan...

Will probably use MDF, glued and screwed.

Scented oil... like 89w90 or ATF? I like where you're going with this...


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Offline moto123

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Re: Workshop Air Filtration
« Reply #4 on: January 04, 2017, 01:49:23 PM »
whoa man, ATF fluid as an air freshener?!?  That gave me a laugh.  My wife would kill me.  Last time I spilled some on the floor it smelled like that for weeks, even leaving the doors open.  That has to be one of the worst smells ever!
« Last Edit: January 05, 2017, 01:45:49 PM by moto123 »

Offline TexasRedNeck

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Re: Workshop Air Filtration
« Reply #5 on: January 04, 2017, 02:03:07 PM »
Make nice with a local AC contractor and you can probably get a used furnace they are replacing for free. It'll be basically a box with a squirrell cage blower in it. Use duct board to make an intake that will accept what ever filter you want. Hang it from the ceiling run power and a control cable to a wall switch or hanging pull switch. Done. Whole thing should not be bigger than 2x2x5 feet.


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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #6 on: January 04, 2017, 03:21:06 PM »
I thought about that.... wanted to speak with our HVAC company about running the gas line for an overhead shop furnace anyway...


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Offline stlaser

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Re: Workshop Air Filtration
« Reply #7 on: January 04, 2017, 06:57:31 PM »
Patton fan, I've had mine for years......
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Offline Flyin6

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Re: Workshop Air Filtration
« Reply #8 on: January 04, 2017, 07:59:09 PM »
20x20 is what the house uses so I'll definitely be doing that... but I think I want a beefier fan than a box fan...

Will probably use MDF, glued and screwed.

Scented oil... like 89w90 or ATF? I like where you're going with this...


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No foolin'

I use dryer sheets to add something better than smokin' old undercoating!
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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #9 on: January 05, 2017, 01:05:18 AM »
Not a patton, but found this from Norther Tool... says it moves 2500 CFM... that's plenty i think. Or, just go on up to the 20" and really have plenty.



Would mount like this, but inverse, so the fan blew from the inside of the box outward

« Last Edit: January 05, 2017, 01:08:27 AM by Dawg25385 »
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Offline Bob Smith

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Re: Workshop Air Filtration
« Reply #10 on: January 05, 2017, 10:58:16 AM »
Kyle, I use a fan like that to move air in the shop/garage when the concrete floor starts getting damp from the humidity in the summer. Granted it is down on the floor not up high, but does get very drafty in there when it is running. More is not always better...

Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #11 on: January 05, 2017, 11:11:01 AM »
Noted. Thanks for the feedback. I would definitely take advantage of the fan's 3 settings, low-med-high if i were to go this route.
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Offline Bob Smith

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Re: Workshop Air Filtration
« Reply #12 on: January 05, 2017, 11:16:41 AM »
I would test run it before taking it home. Mine even on low moves a lot of air. Your building is much larger than mine and being up higher you may never notice a draft.

Offline moto123

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Re: Workshop Air Filtration
« Reply #13 on: January 05, 2017, 01:54:09 PM »
That fan design is not very efficient when installed in a high static application, as is caused by the filter and ductwork.  There are many other fan designs that would be better suited, more efficient, and quieter, however they would all be more expensive.   If you could find a cheap squirrel cage design, similar to what was suggested about recycling an old furnace unit, it would be an improvement.

Offline JR

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Re: Workshop Air Filtration
« Reply #14 on: January 16, 2017, 02:34:12 PM »
Not sure how far you have gotten on this but I would look at a larger fan running slower to move air volume vs just CFM.

I would also mount the fan behind the filter so it will filter the air so as not to build up on the fan itself.

I think 1-2 box fans would work fine, are cheap and easy to replace. Depending on the garage and to not take up room and be quieter mount it in the rafters or attic.
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Offline Bear9350

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Re: Workshop Air Filtration
« Reply #15 on: January 16, 2017, 02:39:28 PM »
When I looked at the amazon link above this popped up:

https://www.amazon.com/gp/product/B00LPD9BDI/ref=s9_simh_gw_g469_i1_r?ie=UTF8&fpl=fresh&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=&pf_rd_r=4TC2X38A58TFB3A30EFP&pf_rd_t=36701&pf_rd_p=a6aaf593-1ba4-4f4e-bdcc-0febe090b8ed&pf_rd_i=desktop

I'm usually for DIY type projects but that doesn't seem to bad for the price and has some pretty good reviews.

Offline Farmer Jon

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Re: Workshop Air Filtration
« Reply #16 on: January 16, 2017, 03:00:58 PM »
We have 2 of these in our shop. 80x80 with 24 ft ceiling. They work awesome. One wasn't quite enough when we do a lot of welding but we have a lot of area. They are not very loud and move a ton of air. They have a paper filter as well as a bag filter.  They are made in USA right here in Nebraska. Easy to install. I just picked up the pallet it came on. Ran 4 lag screws in the wall then 2 chains holding the outside 2 corners. I don't remember what they cost but they are worth every penny.

http://industrial-maid.com/industrialaircleaners.htm

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Offline stlaser

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Re: Workshop Air Filtration
« Reply #17 on: January 16, 2017, 03:10:05 PM »
FJ, what does those cost roughly?
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Offline JR

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Re: Workshop Air Filtration
« Reply #18 on: January 16, 2017, 05:16:39 PM »
The WEN does not show CFM but does show good for 400sf. I have a 2000watt Wen generator that works very well is that speaks to quality.
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Offline Farmer Jon

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Re: Workshop Air Filtration
« Reply #19 on: January 16, 2017, 06:46:09 PM »
I will have to look it up. I  got the paperwork in the shop.
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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #20 on: January 16, 2017, 08:02:36 PM »
I ended up ordering a northern tool patton-style fan. i will build a box to house two 20x20" furnace filters. That's one of the key drivers here, is utilizing 'used' furnace filters from our house, so the WEN and others like it are out. Hopefully will get going on this project soon!
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Offline Farmer Jon

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Re: Workshop Air Filtration
« Reply #21 on: January 17, 2017, 11:54:40 AM »


$1000 or $1200. We had chains got he corners but it blocked the filters in the ends. Made it a pain to change them.

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Offline Dawg25385

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Workshop Air Filtration
« Reply #22 on: March 29, 2017, 01:20:38 PM »
Well, finally got this done. Opted to go with a furnace squirrel cage style blower, and glad I did. It is very quiet, and this sucker moves some serious air.

It's a 4 speed, but I'm only using 2. Using a single pole switch for on/off, and a 3 way switch to control high/low.

I definitely recommend this route for anybody thinking of a similar solution. This is a 3 ton blower, so roughly 1200 CFM on high.

I'm using 20x20x2 MERV 13 furnace filters, which is what the house uses, btw







https://youtu.be/KBD1pFADh6U


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« Last Edit: March 29, 2017, 01:25:51 PM by Dawg25385 »
2006 Chevrolet 2500 HD 6.6 - MotorOps EFI, 4" MBRP, S&B intake, AirBags and B&W Turnover Ball
Prov 27:17, 2 Tim 1:7
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Offline JR

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Re: Workshop Air Filtration
« Reply #23 on: March 29, 2017, 01:39:23 PM »
Vid is good, now mount that puppy.
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Offline Farmer Jon

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Re: Workshop Air Filtration
« Reply #24 on: March 29, 2017, 01:41:00 PM »
Looks real good.

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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #25 on: March 29, 2017, 01:44:26 PM »
Thanks! Will be mounted in the next couple weeks after the walls are insulated and sheeted. I have the insulation and sheeting already, just need to finish up some wiring.
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Offline JR

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Re: Workshop Air Filtration
« Reply #26 on: March 29, 2017, 01:47:48 PM »
Looking at doing mine now that it is sorta clean.
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Offline stlaser

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Re: Workshop Air Filtration
« Reply #27 on: March 29, 2017, 02:33:06 PM »
looks good, where did you buy the squirrel cage blower from it appears to be new.....
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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #28 on: March 29, 2017, 02:54:01 PM »
I got it from a local HVAC guy who salvages them off of busted gas furnaces... i cleaned it up, that's why it looks so spiffy  :grin:
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Offline Dawg25385

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Re: Workshop Air Filtration
« Reply #29 on: March 29, 2017, 03:05:51 PM »
Here's a couple more pics. I ended up trimming out the output hole. I had kind of buggered it up with the jigsaw when I cut it out, so I covered it up


And here's a couple pics with the filters in




I still have to sand it and put a finish on, but its operational now


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Prov 27:17, 2 Tim 1:7
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