Marty Metcalf, director of operational services for the district, said, "Many of the units were flat worn out. They no longer provided ventilation at all." The district also needed to achieve and document classroom ventilation levels as specified by ASHRAE Standard 62-89.
Ron Engelhardt, Trane sales engineer, said, "Older unit ventilators just don't have the capabilities for metered ventilation or for accurate control. Usually the best solution is to replace them with new equipment and to overlay the system with a modern digital control system."