Thanks, what about the odor from the carbon filter?these are pretty vague questions. it depends on your settup. do you have a grow room, box, tent? i use a box so i bring in fresh air from outside the box from the room its in. some ppl have an entire room they often bring in fresh air from an adjacent room. some use air from outside. all you need do for "fresh air" is to exchange the air inside your "grow area" with air from another place. hope this helps a bit.
i dont understand the question about the carbon filter. what exactly did you want to know abt it?
Where is everyone exhausting the air from the grow room too? Isnt it exhausted from the carbon filter?