Dude, hate to tell you by your pic's your plants are already flowering. With the setup you have there is no way your not going to smell them. Your "extractor fan" is only going to complicate that issue unless you have a way to duct it outside or run it through a carbon tube. I'm shocked it isn't a problem now! In your situation you should build you a c-13 cabinet grow. Then stealth it up and you can keep it small and under better control. Good luck! Just curious are they in flower and is that little cabinet light proof? Good luck!