The Marley fresh air heat exchanger MEnV 180 is the ideal addition to your energy saving measures in the house. Particularly in well-insulated houses there is reduced air exchange. Stale air or moisture collects in the building and can trigger dangerous mold and endanger the structure of the house. This can be avoided by regularly ventilating windows. However, the valuable heat and expensive heating energy is lost. The solution - The Marley fresh air heat exchanger - This allows you to let fresh air into the house in a controlled manner and use the existing heat energy. The outflowing used room air warms the inflowing fresh air and ensures a continuous air exchange and a healthy indoor climate without heat loss.