Mixed Flow Fans

Mixed Flow fans are an excellent choice for return air, supply, or general ventilation applications where low sound is critical. As compared to similarly sized tubular centrifugals and vane axials, Greenheck's mixed flow fan will be 5-20 dB quieter! In addition, the mixed flow wheel is extremely efficient and will cut down on operating expenses.

All sizes of the mixed flow are licensed to bear the AMCA Certified Sound (both inlet and outlet) and Air Performance seal, ensuring all data is proven and tested.

Additional features of the QEI include

Overview

  • Model QEI

  • Belt drive construction with motor out of the airstream
  • Air Handling Quality bearings selected with a minimum life in excess of L(10) 80,000 hours at the maximum operating speed
  • Performance capacities from 2,000 to 95,000 cfm (3,400 - 161,000 m3/hr) and pressures up to 8.5 in. wg. (2120 Pa)


  • Model QEID

  • Direct drive construction eliminates belts, pulleys, and shaft bearing maintenance
  • QEID design is more compact for space critical application
  • Partial wheel widths allow for wide performance capacities ranging from 1,000 to 96,000 cfm (1,700 - 163,000 m3/hr) and pressures up to 9.5 in. w.g. (2370PA)


Other Info

  • Greenheck's Total Fan Package

    Greenheck offers a complete fan package including your choice of
  • Motors and Drives
  • Protective Coatings
  • Safety Guards and Motor Covers

    • The advantages of buying a complete fan package from Greenheck include proper selection, design, testing, and manufacturing.

  • Sound Vault Specification

    Panels of the outer housing shall be constructed out of galvanized steel. Minimum galvanized material gage thickness to be 16 gauge. Enclosure walls shall be lined with sound dampening fiberglass insulation having a thickness of two inches (51 mm) and density of 3 lbs. / ft2. Exterior collars shall provide a connection point for system ductwork. Enclosure shall have quick opening and fully removable gasketed access panel(s) to provide access to all internal components.

    To limit breakout noise, inlet and outlet of fan shall be connected to the inside of the enclosure using a slip-fit flexible duct connection. In addition, Sound Vault shall be supplied from factory with internally mounted, one-inch (25 mm) deflection free standing spring isolators.

    Grease filled lubrication lines shall be extended to the exterior of the Sound Vault enclosure. Nylon lines will provide lubrication to fan bearings without removing fan from enclosure. Wiring for fan power supply shall be extended to the exterior of the Sound Vault enclosure and electrical connections shall be terminated at an electrical box.

    Sound Vault enclosure shall be supplied with two formed steel mounting rails. Rails shall be securely fastened to enclosure and have pre-punched holes in both ends to provide for either ceiling hung or floor mounting configurations.

    Radiated sound power attenuation ratings shall be based on factory tests using sound intensity measurement techniques on of both the fan and sound enclosure in combination. Radiated sound power reductions from total sound power shall be available for each of eight octave bands with center frequencies (hz) of 63, 125, 250, 500, 1000, 2000, 4000, and 8000.

    Sound Vault enclosure shall be fully assembled with fan at the factory and shipped as a complete assembly up through QEI fan size 27. Temporary restraining brackets are mounted internal to the Sound Vault enclosure to limit movement of fan during transit.

  • Sure Aire

    If your application requires real time flow measurement, the Sure-Aire is a great accessory to include. The Sure-Aire provides the benefits of traditional flow probes which are placed in the airstream, but with the Sure-Aire's non-invasive design, fan performance is not affected. For more information about the Sure-Aire system, including a head-to-head comparison video, click here.