40 AirTest TR2000-Lon Transmitters, an AirTest CN8000 Controller, and 4 VFDs were installed in this large 300,000 sq/m with a fan capacity of 400hp. Our goal was to reduce the energy consumed by the ventilation system while maintaining the air quality. We were able to reduce the annual operational costs by 90.9% by reducing the consumption of energy by 1,712,000 kWh per year. The payback period for this project was an incredible 1.6 years.