@Mr. Clandestine.. thank u very much... :rasta:

I have put another carbon screen inside the closet. Now the air is being sucked in through the carbon screen and exits through another carbon screen.

I have also put a carbon screen on the active intake and sealed all the edges as much as I could. The smell is completely gone now... :thumbsup:

I also used two screens (one for intake, one for exhaust) to collect dust before it reaches the carbon filters. That way I hope them to last longer. (There was no dust filter before, and the carbon screen only lasted ten days or so)