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Thread: Shopmade Air Cleaner FINALLY DONE w/pics

  1. #1
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    Shopmade Air Cleaner FINALLY DONE w/pics

    Back in December I picked up an old squirrel cage blower for $5. I got it from a drywaller that used it to remove dust and speed mud drying, but he was getting out of the business because of lung issues. I told him I was getting it to make an air cleaner and he said, "Wish I'd thought of that 20 years ago." Made me think about why I wanted one...hopefully save my lungs from dust.

    So far I've built most of the box for it. I used my Kreg pocket hole set for the 1st time and boy did that make things easy. I over drilled a few holes so there are some "bumps" in the MDF in a few places from the scew heads, but it seems to hold well. I have a roll of washable furnace filter that I will use for the first filter and then some finer filters for the second stage. I have it on a moble cab right now so I can move it from the lathe to bench when sanding at each. I hope to finish it up this weekend, but with the warm weather, outside clean up might take time away from that...here are a couple of picks. I'll update when I've done more and let you know how it works.

    Any ideas on how to determine the CFM of the blower? It's a 1750RPM 1/6HP motor.
    Attached Thumbnails Attached Thumbnails 100_0250.JPG   100_0251.JPG  
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  2. #2
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    Looks like a good start, Jeff. You're going to appreciate having it. I don't have the answer to your CFM question, and from what I can see in a quick search, it looks like only the manufacturer of the blower cage will really know. I wonder if you could go through a supplier website (like Grainger's) and look for a cage of comparable dimensions, and see what those are rated at. As I understand it, the CFM rating is proportional to the RPM, and the horsepower has no bearing on the equation.
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  3. #3
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    Can a wind velocity meter be used and some sort of conversion used to figure this out? (Once some type of ducting is created of course)
    Jon

    God and family, the rest is icing on the cake. I'm so far behind, I think I'm in first place!

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  4. #4
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    Nice project. I built one 5 or so years ago with a whole house attic fan, wood scraps, and the paired furnace filters like you're using. The first "stage" is the washable blue filters, the 2nd stage are standard size HEPA furnace filters. The only two changes i recommend are adding casters, a handle or two, and a duplex outlet so that you can wheel it around the shop if you want and plug your sanders (or whatever) directly into it - it works better if it's close to the dust maker.
    All in, i spent about $40 on mine. Someone tried to tell me that it was a waste of time, that the shop air cleaners needed to be engineered to circulate the air correctly or they did nothing but blow air around, collecting no dust and pushing dirty air into every far corner of the shop. I snicker quietly at that every time i clean / change out my filthy filters.
    I've used mine in the renovation of my house also (drywall / plaster work). It'll eliminate a cloud in a couple of minutes - just make it small enough to fit through the door.
    Great little project.
    paulh

  5. #5
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    Quote Originally Posted by Paul Hubbman View Post
    Nice project. I built one 5 or so years ago with a whole house attic fan, wood scraps, and the paired furnace filters like you're using. The first "stage" is the washable blue filters, the 2nd stage are standard size HEPA furnace filters. The only two changes i recommend are adding casters, a handle or two, and a duplex outlet so that you can wheel it around the shop if you want and plug your sanders (or whatever) directly into it - it works better if it's close to the dust maker.
    All in, i spent about $40 on mine. Someone tried to tell me that it was a waste of time, that the shop air cleaners needed to be engineered to circulate the air correctly or they did nothing but blow air around, collecting no dust and pushing dirty air into every far corner of the shop. I snicker quietly at that every time i clean / change out my filthy filters.
    I've used mine in the renovation of my house also (drywall / plaster work). It'll eliminate a cloud in a couple of minutes - just make it small enough to fit through the door.
    Great little project.
    paulh
    Paul, thanks for the pointers...it is on casters already, but adding a plug or two to it would be benefical! When I got the fan I turned it on and let the suction hold a filter up to it while doing some sanding and the filter was caked with dust in no time...I know it will clear out some dust.
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  6. #6
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    Quote Originally Posted by Jeff Bower View Post
    Any ideas on how to determine the CFM of the blower? It's a 1750RPM 1/6HP motor.
    I didn't check out the fan curves but, if you can find a similar blower on this site http://www.delhi-industries.com/

  7. #7
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    I finished this a few months ago, but never took pics to show it. It's crude, ugly and kinda big, but it moves the air and cleans it too! The shop is staying cleaner too. Not as much dust on top of everything, just piles of curlies!
    Attached Thumbnails Attached Thumbnails 100_0716.JPG   100_0717.JPG  
    A man is rich in proportion to the number of things he can afford to let alone. -Henry David Thoreau
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  8. #8
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    So Jeff, in the heat of the summer does it actually do some work of a fan and provide you with a breeze? If so, when working in winter, do you think it will make for an uncomfortable chill?
    Jon

    God and family, the rest is icing on the cake. I'm so far behind, I think I'm in first place!

    Host of the 2015 FAMILY WOODWORKING GATHERING

  9. #9
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    You'll enjoy having that, now and in the future. I've heard folks wonder why you would want to stir up the dust that is already in the air. That is a valid argument and that camp is entitled to their opinion.

    My shop made one is running right now. I was just freehand routing the slot in my router table to do a miter slot extrusion upgrade. The cleaner is not stirring that talcum powder up any more than the router that made it I am pretty sure. By the time I get done typing this and submitting it, the gara. . .er, . . . shop will be well scrubbed and I can go back to work.
    Attached Thumbnails Attached Thumbnails DC-Ambient-1-small.jpg  
    Last edited by glenn bradley; 08-16-2009 at 05:31 PM.
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  10. #10
    Same basic design as mine, but I can tell you from experience that the style filters you have are not going to stop much dust. (This I know as true... BTDT) You need to lay out a couple bucks more and get the paper style filters. they will last pretty long time and can be cleaned with a shop vac a few times before they are shot. with the fiber filters the chunks is all you'll catch the dust still is re-circulated by the fan.

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