SQAD/SQBA Direct Drive Fans

Direct Drive SQAD/SQBD fans combine the performance and efficiency of Chicago's versatile "Square" Fans with the advantages of a compact directly driven arrangement. With the fan wheel mounted directly onto the motor shaft maximum efficiency is constantly maintained. Belt noise, power loss, maintenance and troublesome adjustments are eliminated.


Chicago's Direct Drive Fan is available as a SQBD with backwardly inclined blades in addition to the airfoil bladed SQAD. With the choice of two types of wheels application duty can be matched precisely. Also, the different performance characteristics of the two wheels allow for a wider performance range at standard synchronous motor speeds. The compact SQAD / SQBD fans are used in diverse OEM applications, from packaged forced air and dust collection systems to pressurizing and aeration installations.

Operating range

Maximum CFM 27,366
Maximum Static Pressure 21" wg
Maximum Temperature 180 degree Celcius
Fan Sizes 8-3/4" to 30"


  • Rugged housing
  • Four discharge positions
  • Factory run tested
  • Rigid motor base
  • Streamlined inlet
  • AMCA certified performance


  • Housing drain
  • Spark resistant construction
  • Shaft seal
  • Punched flanged inlet
  • Inlet volume control
  • Cast aluminium wheel
  • Quick clamp door
  • Inlet screen
  • Slip fit inlet
  • Punched flanged outlet
  • Type "B" steel wheel
  • Percentage width add

Alternate Products

Greater CFM Design 64 Packaged Backward Inclined Fan
  Packaged Forced Draft
Similar Products SQA Airfoil Centrifugal
  SQB Centrifugal
  SQL Centrifugal


Bulletin (2.5 MB)Manual (223 KB)