Search terms: living space ventilation system; Ventilation device for large areas; Housing ventilation with energy recovery; Ventilation system with 1000m³ free air throughput; Efficient living space ventilation for several apartments; Heat recovery system for living rooms; Ventilation system with high performance; Heat recovery technology for living areas; Housing ventilation unit with 88% efficiency; Energy -saving ventilation system with EC motor; Filtering ventilation unit for clean air; Air filter; Solid -reduced ventilation technology; Whispering living space ventilation; Multi -level ventilation device for individual control; Safety -tested ventilation system with TÜV seal; Ventilation system including condensate separation and frost protection; Taxed via speed controller on the wal.