Double-Width, Double-Inlet centrifugal blowers that use either Airfoil or Backward Inclined wheels. Typically, their heavy duty welded construction increases to match the AMCA class performance ratings. They are used in commercial to industrial, supply, exhaust or return applications. DWDI move double the airflow compared to SWSI allowing for the sizing of a smaller diameter wheels. Belt drive units are an AMCA arrangement 3 and for direct drive are an AMCA arrangement 7.
