Here you will find ducts with a 3 mm lower outlet to better target the air for longer toolheads/Hotends.
These are not required for High Flow setups that don't change the nozzle height, like chirpy's Rapid Burner. If your setup has the nozzle at the same height as the stock Mini-Stealthburner you will need the "standard" ducts instead.
If you need a different height for the outlet there is a guide to edit the base Fusion360 CAD Files in the docs' folder.