Fully customizable Y duct with movable blast gate

thingiverse

Y duct with a blast gate that's flippable via an external handle (or you can attach it to a motor). Import into Fusion 360 and you can customize every single aspect of it from the duct size to the length of the duct connector, the axle radius for the blast gate, etc etc etc. Just edit the user parameters. Print 2 of the main bodies & glue them together with the blast gate nested inside