Two embodiments of a portable fan for use in the cup holder of a recreational vehicle such as a golf cart are shown and described. In the first embodiment, a bottle-shaped body has a cup-shaped lower portion separated from the body by a shoulder which acts as a limit stop when inserting the base into a cup holder. A shrouded impeller is pivotally connected to the top of the base and exhibits an integral carry handle. The entire structure is made of a suitable plastic such as high density polyethylene. In the second embodiment, the impeller is located intervally of the body for safety and a bell-shaped outlet directs air through a diffuser with circular louvers.