Hey guys and gals, I just put in 2 of these fans. They are USB powered, very quiet and can daisy chain together. One of them I put in my cabinet to exhaust the heat coming off of my carbon filter fan ballast. http://www.amazon.com/gp/product/B009COQYA0/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1