Pre-wired 110V AC Fan.  I use a similar fan in my kegerator to keep temperatures even and help reduce foaming.   See: Kegerator Beer Line Temperatures & Reducing Foam with a Recirculating

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

Pinfox 110V AC Axial Cooling Fan,120mm x 120mm x 38mm, High Speed, Dual Ball Bearings (120mm x 120mm x 38mm)

Also: Kegerator Tips & Gear | Inkbird Dual Stage Temp Controller

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