High Efficiency FHA system Rust Issue

The attached photo shows significant rust on
the system’s components. I saw this on three systems last year, and then again last week.
One unit actually had condensation dripping similar to photo. The intake is connected to the exterior.
Has anyone determined the cause, and the proper repair?

Was it installed according to manufacturers specifications?
Google the install manual, and verify the intake AND exhaust.

:man_shrugging:

Report what you see and refer it out to a qualified HVAC tech for correction is what I would do, Peter.

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Bingo! Report and move on - I tell my clients my job is to report the defects and deficiencies I observe; it is a contractor/expert’s job to determine root cause and make the repair(s).

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Interesting, My guess would be condensation from cold gas in the line?

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Thanks for the replies, BUT, I already know what to write on the report, which is why I asked the question: “Has anyone determined the cause, and the proper repair?” so let me ask again. "Has anyone determined the cause, and the proper repair? Expert HVAC specialist comments preferred and welcomed!