A commercial heat recovery ventilator (HRV) is a type of mechanical ventilation system that is designed to improve indoor air quality by exchanging stale, polluted air with fresh, outside air. It works by taking in air from outside and passing it through a heat exchanger, which transfers the heat from the outgoing air to the incoming air. This helps to maintain a comfortable temperature inside the building while also reducing energy costs. HRVs are commonly used in commercial buildings such as offices, schools, and factories, as well as in residential homes. They are especially beneficial in areas with extreme weather conditions, as they can help to reduce the amount of energy used to heat or cool the building. HRVs are also great for reducing the amount of airborne pollutants, such as dust, pollen, and smoke, that can enter the building.