A vehicular vision system includes a camera disposed at structure at a side of a vehicle. The structure extends outward from a side of the vehicle so that the camera views at least rearward of the vehicle. The structure includes an air conduit having an air inlet at a forward portion of the structure and an air outlet at a rearward portion of the structure. The air conduit is adjustable between a closed state and an opened state. As the vehicle moves in a forward direction of travel, and with the air conduit in the closed state, airflow does not flow from the air inlet through the air conduit to the air outlet, and with the air conduit in the opened state, airflow flows through the air inlet and is directed from the air outlet toward a lens of the camera.

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