"front valance" refers to a specific part of a vehicle's front bumper or undercarriage that is used to enhance aerodynamics and protect the vehicle's components from dirt, debris, or damage. Full definition
Roberts installed an aftermarket Shelby hood and a Shelby front valance designed to integrate with a stock chrome front bumper — the Shelby valance improves airflow to the A / C condenser and radiator, as well as adding hot looks. (automobilemag.com)
The new front valance increases the airflow efficiency to better cool the engine. (ovcmustangs.com)
And, for anyone seeking to actually venture into the wilderness, a detachable front valance improves clearance off - road. (autocar.co.uk)