Howden American Fan Company, a leading manufacturer of high quality industrial fans and blowers, announces it supplied 60 custom designed rooftop supply and exhaust units to a major city in the Northeast, for use on a city maintenance facility. Featuring 304 stainless steel housings and aluminum impellers, the units are designed to provide a long service life in a harsh operating environment.
The rooftop supply and exhaust units are all equipped with adjustable pitch impellers, originally designed for Howden’s JM Series of Axial Flow Fans. Made of high pressure die cast aluminum blades, hub and clampplate with fully adjustable pitch angle, the impeller design optimizes efficiency and performance while minimizing noise. All the impeller components are X-rayed using real-time radiography, and examined to ASTM E-155 standards prior to machining to ensure casting integrity and quality. Impellers are precision-balanced as a fan assembly to minimize vibration levels and guarantee smooth operation.