Untitled record

Method for treating supply air with respect to temperature 1 a regenerative heat exchanger (63), through which supply air and exhaust air flow in a heat exchanging relationship and comprising supplying water to vertical walls of the exhaust air flow channels (74) of the heat exchanger when cooling of the supply air and heating of the exhaust air by means of a burner (87), preferably a gas burner, is required, immediately at the inlet of the exhaust air flow channels (74) when required for heating the supply air. A regenerative heat exchanger (63) for carrying out the method comprises means for producing a flowing water film on the walls defining the exhaust air flow channels (74) and a burner (87) for heating the exhaust air immediately at the inlet end of these flow channels.