Design 51 Single Width Fans

Widely recognized for design efficiency and integrity, Chicago's Design 51 airfoil wheel has ideal characteristics for variable air volume systems. The fan's deep spun inlet and hyperbolic wheel cone plus generous housing proportions provide a smooth stable air flow over the entire performance range. Precision balancing assures quieter vibration-free operation that adds to the overall reliability and performance of Chicago's Design 51 airfoil fans.


The heart of Chicago's Design 51 centrifugal fan is the airfoil wheel, the most efficient type for clean air applications. This fan has an enviable reputation for performance and reliability in a multitude of applications, including industrial supply or exhaust systems. The Design 51 single width is a rugged fan built to Chicago's industrial level of quality and long-term dependability.

Operating range

Maximum CFM 220,000
Maximum Static Pressure 20" wg
Maximum Temperature 850 degree Celcius
Fan Sizes 13-1/2" to 89"


  • High efficiency hollow bladed wheel
  • Stable air flow over entire performance range
  • Rugged industrial strength construction
  • Efficiencies over 80%
  • Spun steel wheel cone optimizes air flow
  • Horizontal or vertical installation


  • Punched flanged inlet
  • Drain
  • Inlet screen(s)
  • Inlet screen
  • Shaft and bearing guard
  • Split inlet
  • Inlet volume control
  • Mount motor and drive
  • Mounted belt guard
  • Punched flanged outlet
  • Cleanout door
  • Shaft cooler and gaurd
  • Spark resistant construction
  • Shaft seal
  • Horizontal split housing
  • A/9 Mount motor and drive
  • Companion flanges
  • Extended grease tube fittings

Alternate Products

Greater CFM AF/BC Custom Heavy-Duty
Higher Pressure Packaged Forced Draft
  IAF Industrial Airfoil
Similar Products Design 10A Airfoil Centrifugal
  SQA Airfoil Centrifugal
  Design 51 Double Width


Bulletin (1.55 MB)Manual (223 KB)