Although I just ordered one of the 12-V fans, I've always used (been a "Fan" of) the ones sold at Wal*Mart for about $15 that use two "D" cells.
It's 103 outside right now, and I'm drinking a 37-degree bneer from my Dometic!
2005 Georgetown 342DS XL, Full Banks Package
2005 Liberty Renegade 4X Toad
1989 Wrangler Sahara Toad
1984 19.5' Beachcraft i/o 5.o liter, 4-bbl (and you thought your Moho sucked gas!)
D/W Carole and Maggie the Teacup Lab (Black Chihuahua)