I just started flowering today on my 2 plants. They are about 2 feet under my 250W HPS in a 8'-5'-8' grow room. The only ventilation i have is a cracked door and as of now i have one fan blowing directly at the HPS. Probably 30% humidity and 70-75 degrees. My question is: Will one fan do the trick or will it still get too hot? Its a pretty big room right? Also, is 2 feet a good distance to keep the HPS away from the plants?