The monschau fresh air purification machine keeps indoor air clean. Fresh air from outside is passed through various filters and cleaned ­several times before being introduced into the home. Sensors monitor the quality of the air. As soon as the carbon dioxide concentration exceeds the limit value, the air purifier automatically activates its “refresh” function and reduces the CO₂ content. In winter, the incoming fresh air can be preheated to up to 25 degrees Celsius. The appearance of the air purifier is characterised by distinctive shapes. The green sidebar sets a stylish accent.