Hi my fellow smokers, haven't posted on here in a wile, but Im back again for another grow. My setup below, having trouble picking a inline fan, ive looked a fans like 4 " ruck would that be the best or can anyone suggested a better fan looking for something quiet. secret jardin dr60 HPS 250w soil 3 autos passive intake digital ballast Rhino pro carbon filter 4" usb fan Any good auto use have grow and would recommend please share, thanks in advance