Abstract: A built-in box for supplying internal units of air conditioning systems includes an essentially parallelepiped-shaped containment body in which there is identified a space delimited by a bottom and by four walls, a tray associable to the bottom of the containment body, for collecting the condensate generated in the internal unit, the tray being laterally provided with at least one discharge duct for discharging the condensate. Inside the tray and in proximity of the discharge duct, there is housed a float which cooperates with the internal walls of the tray for closing the discharge duct at the inlet mouth thereof through a shutter, the float being constituted by a box-shaped element, a laminar wall, rotatably connected to the end part of the tray and stably connected to the box-shaped element, the laminar wall having a gasket suitable to rest against the end part of the tray and close the inlet mouth.

Abstract: A built-in box (1) for the feeding of inner units of air conditioning systems having a hollow element (2) substantially shaped as a parallelepiped, the hollow element having open base and the inside of the bottom (22) provided with a plurality of ribs (24). The built-in box (1) also has a small tank (3) for the drainage of the condensate, the tank (3) being positioned in correspondence with the open base of the hollow element (2) and being provided with at least a section of pipe (33) connecting it to the drain pipe (8) of the building main system. A substantially flat cover (4) can be fixed to the edge of the tank (3).