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To me that looks like a water leak that is being pushed by the air flow. I would be checking for a leak above that location.


It's a water stain, either from a leak as Ed stated or condensation. Check the ductwork for leaks. Once you have fixed the problem, brush on two coats of stain blocker, prime and then paint. Whether you have to paint the entire ceiling will depend on how well you can match the paint.

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