An Energy Recovery Ventilator (ERV) is a device that is used to transfer energy from one air stream to another. It is designed to help reduce energy costs by recovering the energy that would otherwise be lost when ventilating a building. The ERV works by transferring the heat and moisture from the exhaust air stream to the incoming fresh air stream. This helps to maintain a comfortable indoor environment while reducing the amount of energy needed to heat or cool the air. The ERV also helps to reduce the amount of pollutants that enter the building by filtering the air and reducing the amount of airborne particles. In addition, the ERV helps to reduce the amount of energy needed to maintain the desired indoor air quality. By using an ERV, buildings can save energy and money while providing a healthier indoor environment.