Your grow area is just a little bit bigger than mine and i am using 8 cfls and I had to put a exhaust fan in the ceiling and an intake fan at the bottom. But i usually leave the door open while the lights are on. I don't have a small enough fan to fit in the room to blow on the plants so i just use a oscillating fan on them while the lights are on and the door is open. I don't use a fan on them while the door is closed and the lights are off. You will most definitely need to vent the room to regulate the heat.