The centrifugal plug fan impellers are made of steel / aluminum / thermoplastic material with backward curve blades. The impeller is aerodynamically designed for high efficiency and low power consumption. The maximum tip speed of the impeller is 70m/s. The impellers are optimized for stable performance and low noise and balanced according to G2.5 to DIN ISO 1940/1 or AMCA 204. The impeller come with either GG-hub or precision-cast-aluminum alloy hub with steel insert for use with taper lock bushes. GG-hub or Precision-cast- aluminum alloy with straight bore hole are also available upon request. The blades are made of powder coated steel / GI sheet steel / aluminum / thermoplastic.

The inlet cone is made of powder coated / GI sheet steel / thermoplastic. The inlet cone allows a uniform and stable airflow into the impeller assuring cataloged performance.

The overlap distance is determined by empirical and airflow tests which take into account the aerodynamic characteristics of the impeller.