Cool-Space CS6-36-1D One Speed Portable Evaporative Cooler, 36-Inch The industrial grade COOL-SPACE 36" single speed, direct drive is completely portable with a thick, UV resistant housing that will not leak or rust A large 46 gallon built in water reservoir offers hours of operation without a water supply connection Edge coated cooling media for durability and exteneded life Longest warranty in the industry!