Fun Tech Lab made a variety of sizes of miniature wind tunnel can be fun just to compare the aerodynamics of your diecast cars on your workbench or desk top

https://www.thedrive.com/news/funtech-lab-scaled-down-desktop-toy-car-wind-tunnel-price-specs-pictures
https://www.fun-tech-lab.com/

Pricing for the 1/18-scale, 1/24-scale, and 1/64-scale wind tunnels is set at $429, $339, and $239, respectively, excluding taxes and shipping.

There were two larger models, they instantly sold out with the Kickstarter

https://superinnovators.com/2024/06/windsible-desktop-wind-tunnel-for-model-cars/#google_vignette