Local seal casing of the “maze” type, for a passenger compartment heating, ventilation and/or air conditioning installation

A casing (1) for housing, in a heating, ventilation and/or air-conditioning installation, particularly of a motor vehicle, a heat exchanger (3) comprising an air inlet face (12), an air outlet face (13), a rear end face (15), a front end face (14), and at least one side face (16, 17) capped with a radiator tank (4, 5), said casing (1) comprising walls delimiting a heating channel (2) in which is installed the heat exchanger (3), side walls (18, 19) of said heating channel each defining a housing comprising first (21, 22) and/or second (23, 24) primary parts intended to be respectively placed opposite radiator tank side faces, substantially parallel to the inlet face (12) and/or outlet face (13) and in that each radiator tank (4, 5) comprises on its side faces first (25, 26) and/or second (27, 28) secondary protruding parts, said heat exchanger (3) defining a sliding direction extending between said front end face (14) and said rear end face (15) along which said heat exchanger (3) slides during installation into said casing (1), said first and/or second primary parts and said corresponding first and/or second secondary parts being respectively shaped so as to define together a duct (29, 30;

• 31, 32) constraining an air flow to change direction at least three times, so that the circulation of said air flow is limited in the whole of said duct (29, 30;
• 31, 32), the housing being suitable for receiving at least one part of the radiator tank (4, 5) with said first (21, 22) and/or second (23, 24) primary parts and said first (25, 26) and/or second (27, 28) secondary protruding parts being substantially aligned along said sliding direction between the rear end face (15) and the front end face (14) for mating during the sliding installation of said heat exchanger (3) in said casing (1), the housing being located entirely to the exterior of the heating channel (2).