I'm currently running a 250w HPS in a cooltube in a stealth closet which is 100cm/60cm/200cm (3x2x6). Now that winter is coming I'm not having problems with temps anymore.. currently they are around 26C, peaks at 28C. Unfortunately i cant hook up the cab with fresh air from outside cuz the cab is in my room. All i can do is keep my windows open. I'm planning to upgrade my 250w HPS to 300w HPS (using a 600w dimmable ballast)... my question is will i be able to maintain the temps if i upgrade my exhaust fan from 180m3 to lets say 360m3 or even 420m3?