About this 3D model

An adaptor/reducer for a 120mm case fan to a 100mm diameter air conditioning duct. Used on my fume cabinet for my RepRap Prusa Mendel. (Short description: http://www.youtube.com/watch?v=YKh6kgO77Us) The A/C ducting is standard 100mm ducting, as used in range hoods and bathroom extraction fans. The fan end is based off a standard 120mm Case Fan aperture and bolt pattern, such as: http://au.element14.com/sunon/kd1212pmb1-6a-gn/fan-standard-120mm-12vdc/dp/9606416