What size carbon filter do I need

Discussion in 'Growing Marijuana Indoors' started by mattmc804, Mar 20, 2012.

  1. My box is 5ft by 2ft by 4 ft, Im gonna be using a 250cfm fan, 3 plants under 300 watt t5. I've tried using formulas to calculate it but im not good at math. Please help
  2. You need a carbon filter that is rated for 250CFM.

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