All,

I have a '68 AC car that no longer has AC and I do not plan to put AC back in the car since I'm moving to Iceland in a few months.
I'm rebuilding my car but I'm a bit confused. Non AC cars seem to have just a heater duct but still have left/right vent balls but I've only seen ducts running to both vent balls on AC cars.

Am I missing something or are the vent balls on non AC cars just for show?

Thx.