wow Al B. Fuct thanks for the examples and the link

that 6-In 250CFM is a great deal, but yea needs wiring and stuff...ill still try to get the shortest ducting possible (maybe i can get it down to less then 10 feet total)

also for me air leaks in the cool tubes does make a huge difference because co2 is involved. so i believe i would run them at positive preassure/upstream to be more effective?

great info