PURPOSE:To preven the occurrence of dew condensation on a deflecting plate for air direction in a blow-off grill and to prevent flying of water from a heat exchanger, by a method wherein an air speed idstribution and a temperature distribution at the downstream side of the heat exchanger area is made uniform by a baffle member. CONSTITUTION:A baffle 14, inclining in a direction of blast and in a direction extending gradually apart from a heat exchanger 5, is secured to the heat exchanger 5 at the downstream side of the heat exchanger 5 and on a water pan 6. In a temperature distribution at the downstream side of the heat exchanger 5, the baffle 14 mixes a comparatively low temperature air 15 at a lower part 5b of the heat exchanger with a comparatively high temperature air 16 at an upper part 5a of the heat exchanger in the vicinity of a top surface 10a of the inside of a blow-off duct 10, and makes uniform the flow of the mixture flow to blow off through a blow-off grill 11 into a chamber 7 from a ceiling. This constitution makes uniform a velocity and a temperature distribution of the air flowing along an inner front side 10b and an inner rear side 10c of the blow-off duct 10, prevents the occurrence of dew condensation on deflecting plates 11b and 11c for air direction in the blow-off grill 11, and also prevents the occurrence of dew condensation on the top surface 10a of the blow-off duct.
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