Speed up the cooling of your big reflector''''s'' optics to ambient temperature with this small, quiet fan. It attaches to pretapped and threaded holes in the mirror cells of Orion SkyQuest XT8, XT10 and XT12 Dobsonians, Orion Atlas 8 and Atlas 10 reflectors, and the Orion SkyView Pro 8 reflector. Mounting screws are supplied. Runs on 12 volts DC power supplied by the included battery pack, which uses eight D-cell batteries (not included).

You can run the fan prior to observing, then turn it off, or you can even keep it running while observing; there is no noticeable vibration. Battery life is about 13-14 hours of continuous operation.