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    Cooling a 400w hps cool tube, the right way

    Watsup 420 members, i have a bit of an issue i just pikked up a 400w cool tube mh/hps ive only grown with cfls so im fairly new to these lighting systems My question is : wat kind of inline duct fan would keep my 400w cool tube from over heating and burning my plants how many cfm's to cool...
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