Roccheggiani heat recovery units are thought to meet the growing attention paid by markets to such themes as energy saving and indoor air quality. Forced ventilation is establishing as a rife and desirable solution in up-to-date air distribution systems, as it allows the indoor air-change rate to be effectively controlled. As fresh air is supplied into indoor spaces, the exhaust conditioned air is expelled, thus resulting in a greater than necessary energy consumption and consequent increase in operating costs. Heat recovery units represents a solution to combine indoor comfort and energy saving.