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https://www.ost.lu/wp-content/uploads/2021/11/OST_Fenster_Berbourg0012-e1636637637660.jpg515767Proper ventilation means healthy living and more economical heating! In order to avoid phenomena such as condensation on thermal insulation glazing, damp living spaces, mould or mildew stains in room corners, etc., we have put together a few tips for you.