That I can't tell you. I found that odd myself. People are sensitive about these car me included. I never saw a air car with astro ventilation it was one or the other.
Don't matter it can be whatever you want. I have floor vents and A/C at the same time just cause I wanted to.
To make the outer vents have A/C air just got to have the correct top manifold vent and run vents to them.
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