Agreed that search is your friend. But if you follow it long enough you'll find Morelli's [European] Punto:
https://ecomodder.com/forum/showthre...ail-33283.html
Here you have an axial fan in the rear wheels that feeds a duct into the spat area behind the wheels. That's the black part in the lower corners, separate from the boxed cavity with perforated annular screen.
The title could have been spats, wheel covers, skirts or air curtains. Your answers should be saying it's vehicle and use case specific. So, that.