Impellers are available in PP (Size 315 to 2800mm) or Aluminum (Size 315 to 3150mm). Axial fan with upstream inlet vanes are specially designed to increase the pressure head with insignificant changes in power and mechanical efficiencies of a standard axial fan. Wolter Axial fan with upstream inlet vanes can be used advantageously for a standard axial fan whenever considerable operation at more-than-design pressure head is required. Thus, there is no need to change the existing installed duct size. Fan performance complies with AMCA210, GB/T 1236 and ISO 5801. Noise levels tested in accordance to ISO 13347-2. All data are available for downloading. Email us for full catalogue and information.