Applied air systems are an important component of any HVAC system. They are responsible for controlling the temperature, humidity, and air quality in a space. Applied air systems are comprised of components such as fans, filters, and ducts. Fans are used to move air through the system, while filters remove dust, pollen, and other airborne particles. Ducts are used to direct the air to different areas of the space. Applied air systems are designed to maintain the desired temperature, humidity, and air quality in a space. They can also be used to reduce energy costs by using less energy to maintain the desired conditions. Applied air systems are an essential part of any HVAC system, and they are essential for providing a comfortable and healthy environment.