The EasyFlow air duct system is a flexible air duct system for ventilation purposes. The EasyFlow air duct system is extremely suitable for installation in suspended ceilings, insulation layers, insulating filling layers, light filling layers and cement screeds. Vasco advises not to use the EasyFlow air ducts in poured concrete layers. The Vasco Ventilation Concepts air duct system consists of only a few parts. The plenum is connected to the ventilation unit and distributes the air through the air ducts to the connected rooms. There is a valve connection piece at the end of each air duct. In this valve connection piece the adjustment valve is mounted together with the air valve. There is always an air duct system for the supply of fresh air and an air duct system for the extraction of moist indoor air. It is also possible to mount the ventilation valves in the wall, using the vertical bend.