Howden American Fan Co. supplied 60 custom-designed rooftop supply and exhaust units to a major city in the Northeast for use on a city maintenance facility.

With 304 stainless steel housings and aluminum impellers, the fans are designed to operate in outdoor environments. Howden used X-ray radiography to inspect impeller components. Fan components also are examined to ASTM E-155 standards prior to machining to ensure casting quality. The impellers are precision-balanced as a fan assembly to minimize vibration levels.