Atlas Copco
http://www.atlascopco.us/usus/products/air-and-gas-compressors/1467122/

On August 8, 2012 Atlas Copco aquired HSi, an ISO 9001:2000 certified manufacturer of blowers and exhausters – centrifugal as well as high speed turbo models. Their factory in Houston, Texas houses a state-of-the-art engineering, manufacturing and testing capabilities as well as the largest multistage centrifugal blower parts inventory in the world. This allows Atlas Copco to supply their customers with innovative, highly engineered products with very competitive lead times and the best customer service in the industry.

Atlas Copco builds and sells heavy duty, cast iron, vertically split multi-stage centrifugal blowers and exhausters. Atlas Copco also offers the latest technology for blower and exhauster control systems for air or gas applications. Single local control systems, multiple unit systems or complete process control to safely operate those application while maximizing total power efficiency.