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Thanks all. So we will try the insulated duct first as that's an easy fix. If that alone doesn't fix, then may look at the condensation trap.

Hi, In our bathroom we have Envirovent ECO DMEV T LC extractor fan. This is a top floor flat with the duct from the extractor running through the attic to the roof. When we take a shower the ceiling around the extractor is getting damp and we have now a yellow ring formed. Initially we suspected...