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