a 32 quart cooler.you do have portable beer coolers in the shape of a rectangle with a removable lid?i used a coleman 32 quart cooler and cut a 6 " hole on each side and put the 6 "fan inside it.VINTAGE RED AND WHITE THERMOS 32 QUART COOLER 21" L x 13"W x 14"sorry my answer was vague.if you want i can dig mine out and take a pic of it.