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Honeywell S688A1007

Air Flow Switch - For Humidifiers Installed on Variable Speed Furnaces/Air Handlers


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Use this sail switch to activate a humidifier or an electronic air cleaner when you have a variable speed air handler or a variable speed furnace (not needed if you have a Goodman variable speed furnace). This sail switch is mounted in the return air duct where the sail will be in the direct path of an unrestricted air stream.


  • Simplified installations with multi-speed fans, in- accessible air handlers, fan motors with voltage or phase different from controlled equipment; eliminated wiring to system fan.
  • Polyester film sail mounted on a micro switch snap switch.
  • Removable spring counterbalances sail to allow mounting in either vertical (up or down) or horizontal air flow.
  • Top and bottom conduit knockouts for wiring convenience
  • Low air velocity switch operation makes at 250 fpm and breaks at 75 fpm.

Operating Velocity
75 to 250 fpm
Maximum Ambient Temp at Sail
170 F
Maximum Ambient Temp at Switch
125 F
Sail Coverage
26.2 sq in of area
Contact Ratings
24/120/240 (Volts AC)
Insertion Length
10 inches
3 3/4 Inches
2 Inches
3 47/50 Inches

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.