Flow Switches – Air Flow

Air Flow Switches Series AF3

Features and Benefits

  • For general purpose low velocity applications where the most economical flow switch is desired
  • Paddle fits 8″ (203mm) minimum duct size
  • Two electrical knock-outs allow connection from either end
  • Brass, steel and aluminum construction
  • Single pole, double throw snap switch
  • Sensitivity adjusting screw makes flow adjustment easy
  • Can be equipped with a time delay relay
  • Optional feature
    • Two SPDT snap switches
  • Minimum ambient temperature 32°F (0°C)
  • Maximum duct temperature 275°F (135°C)


Installation/Operation Manuals

Parts Lists



    Ready to select pumps as well as suction diffusers, triple duty valves, heat exchangers, air/dirt separators, PIC valves, and parts? Click below to open the new Bell & Gossett ESP-Systemwize selection tool and enter your duty points to begin selecting the most energy efficient system:


    Sizing Tools:

    Steam + Water Pressure Reducing Values

    Software Tool and Application Support/Suggest Enhancements

    Please click the button below to report issues and suggest enhancements.

    Support Request

    System Selection and Technical Product Support

    Consult your local Bell & Gossett Representative for additional assistance.