Inner air quality and energy efficiency are the new trends for offices , residences , houses and such places. Heat recovery units are perfect solution for these needs ands and they are highly demanded. Heat Recovery units are exhausting stall air while supplying fresh air. While changing the stall air with fresh air, it transfers the energy of the inner air to the fresh air through a heat exchanger without mixing the stall air with fresh air. So finally, the need for fresh air had been supplied and energy had been saved through the unit.