Multi-stage centrifugal blower systems from Universal Blower Pac are optimized for efficiency with DC motors, variable-speed controllers and Hibon-Ingersoll Rand Performer/High Performance series multistage centrifugal blowers. They come complete with total process control and acoustical enclosures. The optimized systems can be combined with EE-PAC high-efficiency screw blower systems for widely fluctuating process demands. Models can deliver airflow to 34,000 cfm and a pressure rise of 16 psig. 317/773-7256; www.universalblowerpac.com.