Patent ID: 8220784

Claim:
An evaporative cooler, the evaporative cooler including: a cooling housing having an air inlet and an air outlet; an evaporation media, located within the cooling housing intermediate the air inlet and the air outlet for air flow there through and for receiving water to permit evaporation of at least some water; a drain pan located within the cooling housing and below the evaporation media to catch water which has not evaporated and has fallen from the evaporation media; a sump located within the cooling housing and below the drain pan for collecting water for use in supplying water to the evaporation media; a pipe connecting the drain pan to the sump for water movement from the drain pan to the sump; and an air vent located within the cooling housing and connected to the pipe, the air vent being open to air within the cooling housing and above the drain pan to permit release of air from within the pipe; wherein the evaporation media is a first evaporation media and the evaporative cooler includes a plurality of evaporation media each located within the cooling housing intermediate the air inlet and the air outlet for air flow there through and for receiving water to permit evaporation of at least some water, the drain pan is a first drain pan and the evaporative cooler includes a plurality of drain pans each located within the cooling housing and below a respective evaporation media to catch water which has not evaporated and falling from the respective evaporation media, the pipe is connected to all of the drain pans for water movement from all of the drain pans to the sump, the air vent is located above a highest of the drain pains.