Houston Service Industries (HSi) started as a balancing and rotating equipment repair company serving municipal and industrial customers in the Texas Gulf Coast area. Over its 40 year tenure, HSI has evolved into a leading manufacturer of centrifugal blowers, exhausters and control systems, servicing customers worldwide. Product performance ranges up to 25 PSI (1.7 Bar) pressure or to 18 inHg (457 mmHg) vacuum and flows from 100 to 40,000 CFM (10 to 70,000 m3/hr). HSI manufactures centrifugal blowers and process control systems as well as provides complete blower packages with accessories to meet a wide variety of applications.