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Sometimes, process gases emanating from melting furnaces, kilns have to be cooled before they are passed to the filters due to high temperatures. The hot gases flow vertically downwards along cooling elements. Air drawn from atmosphere by means of axial fans is passed through these elements. The cooling elements are circular tubes or also in the form of rectangular cassettes. As they pass through, they transfer the heat to the air passing through the tubes or cassettes. Then the gases are deflected by 180 deg and some dust also falls down in the hoppers. A temperature controller switches on the number of cooling fans on. At times, a cleaning arrangement is provided to clean the surface of the tubes of any dust collected. These coolers are also called air heat exchangers.