Looking for the ideal solution for collective ventilation in stacked construction? The Duco RoofFan is the most energy-efficient solution for high-rise buildings. In combination with the Intelli Air Valve or iAV, this pressure-controlled roof ventilator forms the first completely demand-driven collective C system. Achieving a jump on the Energy Index in the Housing Valuation System (WWS) has never been easier thanks to the Duco RoofFan and Intell Air Valve. The Duco RoofFan is a pressure-controlled roof fan with an exhaust capacity of up to 3000 m³/h at 150 Pa. The Duco RoofFan provides collective drainage within Duco's Demand Controlled Natural Ventilation Systems (VNV). The pressure control ensures a perfect distribution of the flow rates in stacked housing.