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Product Details ”Click here for full size image” Heatsink - Fan Assembly Your Price: $4.95 Email a Friend | Need Help? Originally made for a Pentium Slot 1 CPU, this 5" x 2" x 1" cooler can be adapted for a variety of uses. It should be especially useful in cooling applications with TEC's (Peltier Junctions/Thermoelectric Coolers). The Sanyo ACE 109X1612H2016 Fan operates on 12VDC @ 0.06A, the fan is 1/3/4" in diameter. The cooling area on the heatsink measures 1-7/8" x 3-7/8". From Mike in Boulder: Orientate the fan so that the large "MC" is right side up. The top pin is ground. The bottom pin is +12. (23F003) Customer Reviews Write an online review and share your thoughts with other viewers! Avg. Customer Review: Number Of Reviews: 3 Great fan 12/23/2011 Reviewer: Alexander McCown (onebiozz@gmail.com) from Maryland US i used this for a mosfet that tends to overheat works like a normal PC fan ... 12v gnd and the 3rd pin is the Tachometric Signal it triggers once every rotation and very useful for watching RPM Was this review helpful to you? 0 of 1 people found the following review helpful: wire review WRONG 09/06/2011 Reviewer: A viewer from earth center is GROUND bottom is 12v not sure what top pin is yet, didn't test, guess is for a switch Was this review helpful to you? 71 of 152 people found the following review helpful: Pinout for Fan 10/12/2009 Reviewer: Mike Seiler (mikeseiler@aol.com) from Boulder, CO US The pinout for the fan is as follows: Orientate the fan so that the large "MC" is right side up. The top pin is ground. The bottom pin is +12. I even got the fan to work well using a 75ma, 12 V solar cell in full sun. Was this review helpful to you?