I have a 12x6x7 room with 20 pots, what size (4",6",8"...) fan and filter combo do I need and what should the CFM rating of the fan be? I plan on adding a hepa filter to the carbon filter/fan combo.
Also what is the difference between the original Can Filter and the 38 Special Can Filter?
Also what is the difference between the original Can Filter and the 38 Special Can Filter?