do you have an intake fan if not replace the exaughst fan and put it were the air comes in the room but keep the carbon filter on the exaust so the pressure would push the air through the carbon filter to escape ,if little to no air goes through then you would have a air leak some where in the room and p.s. the intake fan goes somewhere at the bottom of the room and the exaughst is on the opposite side of the room at the top ......hope this helps and good luck
growhand420 Reviewed by growhand420 on . Question about carbon filter/fan My closet is 7 feet long by 4 feet wide by 7 1/2 feet high....the cubic feet if im correct is 210, Ive read some sites say you want to exchange air every 2 minutes then some say 5 minutes. So at 2 minutes it would be 105cfm and 5 minutes it would be 42cfm. Which should I am for? My issue is I have a fan/filter combo I bought from my local HTG supply store, the fan (4 inch) is rated at 170cfm and the filter is 150-265 cfm. Only problem is it doesn't seem like its helping with the odor at all, Rating: 5