I have just built a new room. It is about 4x6. The walls and ceilings are painted flat white. The light I am using is a 430 watt sun agro bulb. I need to know the easiest way to ventilate this room. Some people suggest using the furnace as an exhaust. I have no idea how to do it the easiest and cheapest way. I keep an ossilating fan on all the time. Right now I have about 20 clones in there. They seem to be doing well. Thanks for any advice you can give me fellow tokers.