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Thread: Jeremiah's New Heli Grow Chamber

  1. #25
    Jeremiah Harris's Avatar
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    Cool thanks for the help,
    -Jeremiah-

  2. #26
    Fred P's Avatar
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    Very nice Jeremiah!

  3. #27
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    Wow! That's a helluva lot of Helis!

  4. #28
    zlookup's Avatar
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    I have always been curious how much air flow is needed. I currently use a variable rate CPU fan which is actually on its lowest setting. i can feel the faintest breeze from it at the other end of the grow space. Given that JH and Butch are using twice the number of fans that are blowing at fairly high rates, wondering if I should up the fan speed.
    --------
    z

  5. #29
    Av8tor1's Avatar
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    Z,

    While 33cfm may be high compared to what you currently have, the 120mm 800RPM S-Flex fan is about the lowest CFM in it's class. The purpose of two of them is really for redundancy sake. If only one fan and power supply were used and either unit failed, you would have an oven in less then a hour. With two lower CFM fans on two seperate power supplies, if either one unit fails then the temps may rise somewhat but a total loss is prevented.

    My plants have already been saved from such a disaster using this design philosophy. I had one power supply fail while out of town for the weekend. Had I depended on just one unit..... I would have had a total loss of all my helis.

    Low RPM, large diameter fans with low CFM provides a nice gentle breeze throughout the rack. Much more favorable growing conditions IMHO

    FWIW, that S-flex fan model uses the Sony high performance bearings and is rated as one of the most reliable PC fans made (going by newegg customer feedback) I selected it after careful consideration of performance/value/reliabliity

    :-)
    Last edited by Av8tor1; 05-20-2011 at 09:35 AM.

  6. #30
    zlookup's Avatar
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    Ah, that makes sense. Thanks for explaining.
    --------
    z

  7. #31
    Jeremiah Harris's Avatar
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    I had a terrible time trying to the those fans. Here is a link to a site the has them in stock.

    http://www.endpcnoise.com/cgi-bin/e/...lex_120mm.html

    Thanks,

  8. #32
    Jeremiah Harris's Avatar
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    After only a little over two weeks in the chamber they have already stared to color up.

    H. pulchella on May 3rd grown in the greenhouse



    Now on May 20th.


    -Jeremiah-

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