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Commercial ERV/HRV has bigger airflow type than residential ones, widely used in large commercial buildings and industrial applications, such as office buildings, hotel, theater, Hospitals, labs, confinement center, school, bank, etc. It's also balanced ventilation system which use both an exhaust air blower and a supply fan that does not pressurize a building. Stale room air is exhausted and fresh outdoor air is brought into the structure. And there is air-to-air heat exchanger that is designed to transfer heat and sometimes moisture between two air streams. They improve the indoor air quality and reduce the load on air handling units to be more energy saving and efficient.

Residential ERV/HRV is whole house ventilation with heat recovery. You can also call it whole house air exchanger or whole house fresh air system. Constant fresh air in your home is an important aspect to maintain the indoor air quality. A good ventilation system will protect your family from unpleasant odors and harmful contaminants such as formaldehyde and VOCs. Opening window is a simply way to increase ventilation, it can make your air feel less stuffy, but pollen and other allergens will be invited into your home at the same time.