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The Ultimate Odour Control Thread

Discussion in 'Indoor Growing' started by Arrid, Jul 16, 2008.

  1.  
    ImNewtoit

    ImNewtoit Member

    What grain size of activated carbon do you use ? I refilled mine with some and it isn't working well at all. Maybe the grain size is too large??
     
  2.  
    McStrats

    McStrats Well-Known Member

    I'm a novice grower but I design odor control systems for many industries like plastic extrusion vents where the odors and VOC's are pretty high. Working out your carbon filtration is really just a matter of doing some math. Hopefully some of you will find this useful.

    For carbon to work properly the smelly air needs a certain amount of "dwell time" in the carbon. I see a lot of people use fan systems that are too poweful and the air gets pulled too quickly through the carbon. The prices some of you are paying on amazon and other places is high also. Get in touch with these guys http://www.generalcarbon.com/ and ask for a carbon pellet that is formulated for cannabis. Potassium permanganate is another odor absortion media works well. There are literally 100's of different carbon formulas for VOC and odor control.

    To work out your cfm needed for 10 air changes per hour you multiply your fan systems cfm x 60 and divide by the volume of the space. For example...if a 4" cent' fan has a cfm rating of 187cfm and your space is 6' x 8' x 8' then 187x60=11,200/384 = 29.1 ach.

    So..a 4" fan that does 187 cfm running on full speed with an line carbon filter is pulling too fast and the air is not getting adequate "dwell time"...but that same fan running at 1/2 or 1/3 speed is going to be much more effective.
     
  3.  
    ImNewtoit

    ImNewtoit Member

    I haven't read all of the posts in this thread, too many, BUT, here's what I did: Bought a nice big quality filter and when it was used up, I just drilled out the 3 rivets holding the bottom cover on, emptied it out, and poured in new carbon which I buy in bulk. Put the cover back on, put in 3 new pop rivets and it's good as new! If others are doing this, I'd like to know more about their carbon suppliers. Maybe my supplier isn't the best deal out there :-)
     
  4.  
    McStrats

    McStrats Well-Known Member

    http://www.generalcarbon.com/
     
  5.  
    ImNewtoit

    ImNewtoit Member

    General Carbon is where I've been getting it. What granule size do you use?
     
  6.  
    McStrats

    McStrats Well-Known Member

    I have access to sealed carbon cells in my day gig and I generally grab whatever is surplus. I'm not sure of the granule size but I do know its in the mm's.
     

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