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Thread: DIY air filtration unit for <$200

  1. #76
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    Gary,

    It makes no difference to the system if you scrub your exhaust... it only matters to your lungs if you exhaust inside.
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  2. #77
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    Hi all,

    General Carbon provides their carbon to aquarium owners in smaller quantities at this URL:
    http://shop.happyfishcarbon.com/main.sc

    I was assured by a General Carbon sales person that carbon is the same as that used by Dan.

    I got two gallons shipped to me for $48. A gallon does a 3" layer in my instance of Dan's design. Shipping is a hefty $19 regardless of amount.

    I fired up my scrubber yesterday and I was still getting some odor out of the exhaust. I need to tweak my implementation a bit. One thing I did wrong was wrap the filter material up the walls of the scrubber for a couple of inches. That is probably allowing fumes to skirt around the carbon.

    I did some other changes to the design, too. I attached the filter support to the walls with tie wraps going through holes I drilled in the walls. I did this because PVC didn't want to stick to the plastic walls. I covered the holes and tie wrap stubs with a strip of duct tape. Ugly but air tight. Also I am not using the HEPA filter currently since I am running my exhaust outdoors. The smell going outside is hardly detectable. I have tried it with Acrylic and mdf and I can smell the wood smoke from MDF fairly distinctly, to the point that I wouldn't want it going inside my shop.

    I'll fix the filter material configuration and tune the amount of carbon I am using and I am sure it will work great.

    With the smaller outlay for carbon and not using the hepa filter I was able to get a working prototype for around $100.

    Thanks again Dan for the cool design.

    - Leon
    Last edited by Leon Shreves; 01-01-2011 at 10:28 AM.

  3. #78
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    Ouch on that pricing... 2 gallons is what, about 5 or 6 pounds? For twice the price I got 50 pounds... anything more than very slow hobby will go through that 2 gallons in a heartbeat as that's about a single charge.
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  4. #79
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    Darn!!! I wish I would have seen this thread before spending $1500 on a filtration unit that only filtered for about an hour, filters alone cost more than you entire set-up. Going to see about using this as a pre-filter for my unit to see what happens. I may also see about packing more charcoal into the unit I have. Thanks Dave for sharing.
    Scott Woodson
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  5. #80
    Was NASA your inspiration on this filter build? You didn't by chance
    just finish watching Apollo 13 before you put your filter together did you?

    In all seriousness nice job.

    http://www.youtube.com/watch?v=Z3csfLkMJT4&NR=1

  6. #81
    FWIW...

    27 lbs of 4mm pellets == 1 cubic foot.
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  7. #82
    Quote Originally Posted by Bob D. View Post
    Was NASA your inspiration on this filter build? You didn't by chance
    just finish watching Apollo 13 before you put your filter together did you?

    In all seriousness nice job.

    http://www.youtube.com/watch?v=Z3csfLkMJT4&NR=1

    Bob++

    Classic!

    Bonus Karma for that!!!!!
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  8. #83
    Join Date
    Dec 2009
    Location
    British Columbia Canada
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    Greetings all

    I'm new here and have been reading many of the various posts and can only say wow what a vibrant community. It has taken me quite a while to find it.

    I have a question regarding this really neat filtration unit design. I'm thinking of building one to use for filtering mostly rubber and romark fumes on a Legend Ext 75. The sytem that I am using now is rather large and clunky and I'm hoping that I can switch to this design which is very keen!

    Has anyone tried this with rubber?

    Thanks
    Regards
    Dillyn

  9. #84
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    I'm not a fan of rubber (of any type) in the laser, but I did it once to test the unit. The only real smell I noticed was once I stopped the air and lifted the lid (no matter what I cut, there's a always a faint odor in the air). the carbon layer does na excellent job of keeping the exhaust clean of noxious fumes.
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  10. #85
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    Hi Dan,

    Thanks for the prompt reply, I appreciate the help. My apologies for the tardiness of my response it's been a rather busy time lately. I don't have a lot of choice about rubber in the laser as I make rubber stamps. I'm going to be assembling a slightly larger garbage can version of your filter design. I'll let you know how it works out.

    Thanks again
    Dillyn

  11. Should i wash the charcoal before put it in the trash can ? i got a beautiful black powder.......

  12. #87
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    Wet charcoal won't capture anything...
    Hi-Tec Designs, LLC -- Owner (and self-proclaimed LED guru )

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  13. how to eliminate the black powder ? leave it on for a whole day ? or did i bought the wrong activatec charcoal ?

  14. #89
    Quote Originally Posted by carlos alencar View Post
    how to eliminate the black powder ? leave it on for a whole day ? or did i bought the wrong activatec charcoal ?
    Just rinse out the pellets using water and let fully dry before using.

    Wet activated carbon depletes oxygen, so do this outdoors.
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  15. #90
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    I just run the machine for a few minutes, take out the HEPA filter and bang it on the ground for a minute or so... repeat, if necessary. I'm not a fan of washing as any chlorine in the water (along with many other chemicals) will reduce the effectiveness of the charcoal. After all, activated charcoal is what they use (among other things) to make water filters, with the primary element removal being chlorine.
    Hi-Tec Designs, LLC -- Owner (and self-proclaimed LED guru )

    Trotec 80W Speedy 300 laser w/everything
    CAMaster Stinger CNC (25" x 36" x 5")
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