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    ADVICE ON CFM AND EXHAUST. PLZ help

    I Have a 440cfm 6" inline fan + 6 inch Carbon Filter for my 4 x 4 x 7 Grow tent. I have only been using my 450w LED, so the temp has not been high enough to run my inline fan. Today I turned on my 400w MH , so I decided to turn my inline fan on. It comes with a speed controller , so I had 440cfm...
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