Insert for suction duct

An insert for an air intake of a suction duct, the insert comprising:

• an inner portion configured to extend within the suction duct, the inner portion including a conduit having opposed inlet and outlet ends, the conduit having a central axis extending along an inlet direction at the inlet end and along an outlet direction at the outlet end, the conduit being curved so that the inlet and outlet directions are non-parallel, the outlet end having a smaller cross-sectional area than that of the suction duct and having a jagged trailing edge defined by circumferentially spaced apart notches;
• a mating portion configured for sealingly engaging the air intake, the inner portion extending inwardly from the mating portion;
• and
• an outer portion configured for extending outside of the suction duct, the outer portion extending outwardly from the mating portion, the insert including an inlet extending in the outer portion and in fluid communication with the inlet end of the conduit, the outer portion including a curved lip surrounding at least part of an inlet opening of the inlet and defining a leading edge of the inlet;
• wherein the inlet has opposed upstream and downstream sides with the downstream side being closer to the outlet end of the conduit than the upstream side, the curved lip forming a protuberance along the downstream side, the protuberance extending outwardly further than a remainder of the curved lip.