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Drywall is installed as an air barrier above the central hallway duct chase prior to installing the trunk ducts.
Drywall is installed before framing in dropped soffits to provide an air barrier above these duct chases.
The builder installed plywood under the roof rafters and air sealed it with tape then added a dropped ceiling with metal framing to provide a service cavity for ducts and wiring, without poking holes in the air barrier.