THE 100 cfm fan if separate from the 440 cfm can-fan thats just to push the hot air out of the lights... The air is being pulled through the filter through a hole that exits my room im pulling air into the room from the outside of the room. the dehumidifier is in the room below the carbon filter in the room and it pulls the hot air from the dehumidifier out of the room. Im getting a smell from cigarette smoke cause thats the only thing I could think of with a strong odor that i could test to try to see if its working and im still getting a smell i have a switch for the fan and I have it turned down to 70% the can filter requires 412 max cfm my fan puts out 440 cfm so at 70% i don't think that is a bad percentage for my fan to be at? Im stumpped