The role of ventilation in existing buildings is the focus of this talk. At the table, manufacturers of the VSK, Inventum, Itho Daalderop and Orcon, discuss the latest trends. Orcon won a VSK Award with a compact balanced ventilation unit, Itho Daalderop shows how to sustainably boost a ventilation system, and Inventum uses ventilation air as a source for a new heat pump.