8in fan and filter coming in from a bed room with a window unit to keep it nice and chilly and the exhaust us out to my walk in pantry and I have the inline fan hooked up to a fan speed controller. I've only grown a couple plants at a time with my 400 so im looking forward to seeing what this set up can yield. The ballast is a runnable 1000. The hood is a 3x3 big daddy and its pretty solid.