I agree, it seems awfully odd for a unit to be prepped for a 2nd A/C (including a breaker that's labeled in the power distribution box) to not have a 14" x 14" vent where the A/C would go.
Typically for those that are pre-prepped, all you need to do is remove the vent & trim and the framing and wiring is right there waiting. You mount the A/C unit in the hole where the vent was.
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