STMicroelectronics' production facility in Phoenix, Arizona needed to quickly convert 2,000 sf of office space into Class 10 production cleanroom space. We were asked to design an energy efficient system that fit a specific budget and met a fast track timeline. The project challenges included a low ceiling deck height of 14 feet and a requirement that sound levels be lower than adjacent fan filter unit cleanrooms. Our design team developed an innovative, cost effective strategy that used low cost tube axial fans with specially designed low-pressure drop silencers, designed into a system with low external pressure drop. This allowed for smaller motor and VFD size. To further save cost, six of the fans were controlled by a single VFD. Our design solution met all of the project goals, including a factor of four reduction in energy use and a substantial reduction in noise levels. The low energy results were in line with STMicroelectronics' global commitment to lower the environmental and energy impact of its facilities. Since working on this project, Rumsey Engineers, has completed several other low energy HVAC design projects for STMicroelectronics.