FILTERING DEVICE FOR THE AIR TAKEN IN BY AN INTERNAL COMBUSTION ENGINE WITH RESIDUAL WATER DRAINAGE

Filtering device (1) for the air taken in by an internal combustion engine; the filtering device (1) having: an air-box (2) that defines inside it a cavity and has at least an inlet opening (3) toward the external environment and at least an outlet opening toward an engine intake system (4); at least a filter (5), which is housed inside the air-box (2); a drainage through-hole (10), which is formed through a lower wall (8) of the air-box (2) and allows the drainage of any residual water inside the air-box (2); and a valve (11) which is coupled to the drainage hole (10) and is movable between a closed position, where it closes the drainage hole (10), and an open position, where it lets the drainage hole (10) free.