Our ventilation device ECO 250 Pro Untroma is extremely quiet and the perfect solution for maximum efficient living space ventilation, an excellent indoor climate with fresh and oxygen -rich air. With a volume flow of 250 m³ per hour, this device offers the ideal performance for houses, shared apartments and apartment buildings. The integrated multi-sensor air control measures and regulates precise humidity, CO2 content, fleeting hydrocarbons (VOC), fine dust (pm2.5) and temperature. Personal your ventilation to the individual conditions in your room. Two cross current heat exchangers connected in series ensure maximum energy efficiency. According to the ECO Design Directive, a heat recovery of 83% is achieved (without condensation). Under normal conditions we reach up to 96.8%! The middle.