Is there a way to easily split a wall register?
My parents' house has one place with vents that look exactly like that - the duct has two vents, one on each side, and there is a baffle inside such that you cannot look through the vent and see the other room. The baffle extends about 1-2 inches past the edge of the registers.
I spent some time trying to find a pre-made part (or even a picture of someone having done this), but I can't find one.