Bolts together for easy access and rust/corrosion resistence Blower - Machine balanced for smooth, quiet operation and maximum air delivery Pump - Permanently lubricated bearings can run with or without water Built-in leveling leg - Window units include house legs for leveling and extra support * Except for N28W unit that set our coolers above the rest Selecting the right Essick cooler is EASY 1. Consult zone map to find correct size. 2. Consult table below to find correct "minutes per a