Since I haven't actually seen a setup I don't know how the smell is so it's hard for me to say what it would take to get rid of all smell.... so my question is: If I don't use attic exhaust in my closet, will I be able to get rid of all smell? What's most effective? To carbon scrub air coming out of closet (using exhaust in door) or build an air tight box INSIDE my closet and carbon scrub exhaust coming from the box? Either way I would also use an ona setup in the closet or room. Will this get rid of all smells?? Also, if I do this way, how long does the carbon/ona last? Will it last for an entire grow? 2 grows? 1 year??