Bent ventilation conduit for air conditioning system of motor vehicle, has noise attenuating unit with reflecting zone located in bending section, opposite to upstream section, and partially reflecting incident waves towards opening

摘要

The conduit (10) has an upstream section (12) provided with an opening (14), and a bending section (20). A noise attenuating unit includes a plane reflecting zone (30) that is located in the bending section, opposite to the upstream section. The attenuating unit partially reflects incident waves towards the opening. The reflecting zone is oriented so as to form an angle of 90 degrees with respect to a longitudinal axis of the upstream section.