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Thread: Extraction fan help

  1. #1

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    Default Unanswered: Extraction fan help

    I’m looking for some guidance buying a new extraction fan. I just have a 4” just now. And was getting hot with 400hps on so I was thinking how much bigger should I go 6” my tent is 90x90x180
    I was looking at these ones. Is up to 517m3 too much for my size or will it be alright ?

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    hotshot (02-06-20), jingo (02-06-20)

  3. #2

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    Default

    The volume of your tent is 0.9 x 0.9 x 1.8
    =1.458 m3

    As per https://www.thctalk.com/cannabis-for...ion-The-basics

    "The fan should be able to replace the air volume (length x width x height = total volume in cubic feet) of the grow room in less than 5 minutes."

    At 5 mins per "total air refresh rate", your tent needs a fan that can pull:

    1.458 x 12
    = 17.50 m3/hour

    Numerically your fan with a 165 m3/hour rating should be nearly 10x what is necessary. But In Real Life...

    If it was me I would be looking at the 6-inch fan and diall that down with a fan controller too.
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    Bigdaddy 101 (01-06-20), hotshot (02-06-20), jingo (02-06-20), M_C (02-06-20), Uv123_4 (02-06-20)

  5. #3

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    Default

    Cool was thinking the 6”
    My 4” I have just now says 110m3
    And on that link above it says have a 4-1 ratio for outtake to intake so I should be pretty good at that I would say. ?

  6. The Following 2 Users Say Thank You to Uv123_4 For This Useful Post:

    hotshot (02-06-20), jingo (02-06-20)

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