- Healthy and fresh air is very important for human being in both his private place and his working station.

- In a limited space the air that we breath is quickly polluted, due to the presence of CO2, dust, pollen and bacteries.

- Any dwelling, shop or building need a good distribution of air ventilation in order to create the necessary conditions to meet our primary needs.

- The principle of "regaining heat" consists in the fact that the heat of the hot and polluted air from the dwelling, before it is being exhausted, is delivered to the cold and fresh air coming from the outside.

- This action results in a comfortable temperature of the incoming fresh air.

- Loss of energy is reduced to a minimum due to the so-called "regaining-heat-system".

- The air flow ventilation can operate irrespective of the airco (e.g. during middle-season).