When “energy waste” is mentioned, the majority of Germans automatically think of electricity first. Yet most of the energy produced in the home is wasted mainly by the loss of heat. Especially owners who have equipped their houses with ventilation systems, e.g. in the bathroom or kitchen, risk energy losses due to unwanted air exchange.

No more energy loss through ventilation ducts

A backflow flap within the ventilation duct prevents cold air from entering it in the winter or prevents warm air from escaping in an uncontrolled way. Use of a backflow flap is possible and useful in all mechanical extract ventilation systems. These are mainly installed in rooms that are not (cannot) be ventilated continuously – for example, in inner-lying bathrooms* – or in those in which a large amount of exhaust air is produced within a short time, which must then get outside, like when cooking in the kitchen. It is also advisable to install backflow flaps in vents and terminals on the flat roof, as the air ducts to the outside are shorter there than on the pitched roof and cold air can therefore get into the inside of the building faster.