Outfit your semi to be Ready for the Road Ahead with enhanced airflow, with the Fleet Engineers 12.25" x 10.25" Exterior Aluminum Adjustable Louvered Vent. This replacement component works to promote airflow into a vehicle while blocking contaminants, insects, debris and other elements. Crafted with an adjustable slide arm to open or close the vent as needed. FleetPride is your First Click in Heavy Duty .