Building with a ventilation system and method of upgrading an existing building to such a building

摘要

The invention relates to a ventilation system comprising a plurality of ducts (9, 11, 13, 14,15, 16, 17) for supplying air to or extracting air from rooms (1, 3, 4, 5, 6, 7) of a building. At least one of the ducts here is designed as an annular duct comprising two subducts which are connected in parallel in terms of flow.