Sail switch with 5-inch wide sail activates electronic air cleaner, humidifier, or other equipment in response to airflow from system fan. The S688A is mounted in return air duct where the sail will be in the direct path of unrestricted air stream.
Simplified installation with multi-speed fans, inaccessible air handlers, fan motors with voltage or phase different from controlled equipment; eliminated wiring to system fan
Polyester film sail mounted on 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 feet per minute (FPM) and breaks at 75 FPM
For use in ambient temperatures normally prevailing in spaces made for occupation, which usually are not higher than 77F (25C) degrees but occasionally may be as high as 104F (40C) for brief periods.