Attaching a bit of a long winded video on fixing the A/C ceiling plenum divider which fixes the "short circuit" of warm and cold air in the ceiling and can reduce the amount of air being forced through your ducts. Just gives you an idea of what the plenum typically looks like. I am not familiar with your coach though, so it may not match your situation. Did your A/C ducts work OK originally and now they don't? Do some ducts work OK and not others?
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