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YO ,
you need to know how many cubic feet are in you grow space.. THen buy the one that covers that specfic space. (or roughly close to it) But the way i use it is this . I have a smaller grow room than my entrie basement. So i bought the Big one and put in the Basement and put a fan on it . Not blowing super hard just enough to move air across it , thats it .,.. Works wonders.. GL
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