That 50 CFM fart fan is not really going to help a lot - I wouldn't even bother with it. I use a 110CFM fart fan in a 59x15x30 cabinet, and its barely adequate. Plus they are really loud unless you spend a bunch of money for a quiet one.


A 4-inch hose coming from the closet out the window is not going to be very stealthy . Are you on the top floor? The bathroom has to be ventilated since there is no window in there - any chance you could use that ductwork for the end result? ie cut a hole in the closet wall into the bathroom, then install a vent register or something so it looked clean?

What type and how many watts of lights are you planning to run? 10-15 plants seems a little ambitious and will definitely need some form of odor control