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According to Google a 20 inch window box fan will draw 50 to 100 watts.
Solution B: For less than $30 you can get a small fan that runs on D cell batteries
Solution B: For less than $30 you can get a small fan that runs on D cell batteries

RoadPro 10-Portable Fan with Dual Power Options of 12-Volt or D Cell Batteries RP8000 - The Home Depot
Keep your cool wherever your active life leads you with this great-looking portable fan. An easy and convenient way to enjoy a refreshing breeze in you truck, car, recreational vehicle or picnic bench,
www.homedepot.com