Props to aerohead for using
duckduckgo.com/?q=furbelow&ia=definition
But I'd characterize it as a bargeboard:
Quote:
Bargeboard
Aerodynamics
Bargeboards are pieces of bodywork on open-wheel racing cars, serving a purely aerodynamic function. They are curved vertical planes situated longitudinally, between the front wheels and the sidepods, held away from the chassis at the front on struts or other connectors, and connecting to the sidepods or extensions of the floor at the rear. Wikipedia
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