This Armstrong Air 60L46 3 Inch Concentric Vent Kit is a great way to improve air flow in your vehicle. This vent kit includes a 3 inch concentric vent and is made from high quality materials. This vent kit is easy to install and will improve air flow in your vehicle. This Armstrong Air 60L46 3 Inch Concentric Vent Kit is a great way to improve air flow in your vehicle. This vent kit includes a 3 inch concentric vent and is made from high quality materials. This vent kit is easy to install and will improve air flow in your vehicle.