Operational since 1973, HSI (Houston Service Industries) is one of the world's leading manufacturers of centrifugal blowers, exhausters, and control systems. Located in Houston, Texas, it offers an array of products, such as multistage centrifugal blowers, high speed turbo blowers, remanufactured blowers, blower control systems and blower accessories. The company provides a complete array of aftermarket parts and services for centrifugal blowers, including in-factory blower overhauls and re-rates, on-site blower troubleshooting and repair. HSI (Houston Service Industries) is an ISO 9001-2000 certified company. Some of its applications include pneumatic conveying, water & waste-water treatment, petroleum and chemical industry, central vacuum systems, general industrial and environmental.