Air intake comprising at least one deflector (1) which is provided with one or more walls (5, 6, 9) suitable for conveying air through an opening (4) made in the body of a motor vehicle (2), and which is hinged to at least one member (7) of the motor vehicle (2) for being rotated by at least one motor (19) around an axis (3), so as to modify the size of said opening (4). The angle comprised between the rotation axis (3) of the deflector (1) and the vertical symmetry plane of the motor vehicle (2) is preferably not greater than 45, in particular less than 5.