About this 3D model
Fan duct adapter for a 92mm fan to fit 76mm ducting from ebay. http://www.ebay.co.uk/itm/170727103059?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 Outer diameter is 72.5mm to fit inside of the rubber. Mounting holes are M4 Sketchup file included.