(57) A heat exchanger (1) in which a first casing (19a) is disposed within a second casing
(5) and delimits, within the interior of the second casing (5) itself, two lateral
chambers (23, 24) able to communicate with the interior of a cabinet (3) to be air-conditioned;
the first casing (19a) has two side walls (20, 21), a water collection vessel (25)
connected to the side walls (20, 21) in a fluid tight sealing manner, and a cover
(32) releasably coupled to the side walls (20, 21) and to the vessel (25) in a sealed
manner; the first casing (19a) housing a heat exchanger unit (35) being disposed in
a position raised with respect to the vessel (25), a dividing partition (41) extending
between the heat exchanger unit (35) and a bottom wall (26) of the vessel (25) to
define an inlet chamber (42) and an outlet chamber (44) each communicating with an
associated lateral chamber (23, 24) and each housing an associated single flow deflector
screen (46, 47) fixedly connected to the cover (32).
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