Thanks for the advice. I am going to buy a stronger inline fan like 6 inch 450 cfm to replace the home depot fan, to exhaust the hot air into the attic. Do you think i should set it up like my first setup: I have a 4 " ducting connected to the top of my hydrofarm hood which is connected to dissapointing 6" inline fan from home depot that is more of booster fan type i think, then from the fan another lenght of 4 " ducting exhaust into the attic. The light is sealed besides a intake vent on the side of the hood. Do you think replacing the home depot fan with a more powerful 450 cfm inline fan and connecting the intake vent on the hood to some ducting that leads outside the closet to cooler air in my bedroom. It is 1000w HPS, so it puts out a ton heat as you know. Or do you think i am going to add another source of cool air, although living in the apartment i would have to connect a duct from a AC vent in the bedroom and hang it from the cieling to the closet.