You need a room scrubber to continually scrub air. Get another carbon filter for when your exhaust. The exhaust filter should be bigger then exhaust fan. You will then virtually have no smell as you have one filter continually running in the room and the other one for exhaust
Wekl quit being a dick and use ur head you have 1 filter and fan for air scrubbing and exhaust. If you have a 800cfm filter run a 400cfm fan to make the air slowly pass thru carbon for a better scrubbing. The faster the air moves thru filter the less it filters the slower ir moves thru filter the better the air bis scrubbed. Its always smart
to have 1 filter thay scrubs
the air in room and another for extraction.
if your humidity in the room is above sixty percent your fan wont work at all... its collecting moisture and clogging the filtration... I dont even exaust my 5x6x7 room with a 170cfm fan and 200cfm capable filter
here is what i use. have this at the end of your ducting. but dont have it blowing into your living room lol. have it go into the attic or walls or something. you also need to have like 20ft or so of ducting after it so it can turn everything into o3