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Thanks for the comments Stem. The thermal insulation might just do the trick. The pipe is vertically passing through a roof void hence the concern about condensation, but as you point out it may not turn out to be that big an issue

Installing 90mm by 180mm (150mm equivalent) flat channel duct work for kitchen hood extractor fan. The exit is vertical and the majority of the run will be covered by plasterboard. I will need some way of removing condensation however all the 150 traps I've found are round. Is there a way to...