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Polygon
@Zebra_Cyclist
@Silly_Savage you seem to be addressing the symptom and not the problem and spending a lot of money to do it. The reason you have a problem in that bathroom is that you have three external walls which if the building is Victorian are probably 9" solid brick (so no need for specialist core driller) which provides little or no insulation. You need to address this before spending lots on extractor fans. Also if you are replacing the window go for triple glazed wood Rationel do excellent ones