Has anyone tried this with just one fan in exhaust mode? Thinking about blocking off the rear section, and having front blow down. Or vise versa, depending once I look inside the box again. ideally you want to pull air in through the box vents, and exhaust it, rather than blowing into the box. I'm planning to remove the 3 fans and probably the bottom plate of the psu. At 30cfm, that's basically refreshing the air in the box every 2 seconds. It's overkill for this little heater. Too bad they don't just put a 120 on top of it in the first place. It might not be as pretty, but it would ventilate very well, be very quiet, and eliminate the need for 3 fans in a box this size. Probably would have been cheaper for the manufacturer too.