Honeywell Air flow sail switch is designed for ON/OFF control application in multi-speed fans. It is installed on to accessible air handlers and motors of fan. It features SPDT contact configuration and works on micro switch snap action for convenient ON/OFF operation. It has removable spring counter-balance sail to allow mounting in either vertical or horizontal airflow. Switch is connected to controller that controls phase and voltage of the fan. It eliminates connection of additional wiring for hassle free operation. It is constructed from chemical and abrasion resistant polyester. It is provided with top and bottom conduit knockouts for convenient wiring. Low air velocity switch operation makes at 250 fpm and breaks at 75 fpm. It has operating temperature rating of 125 deg F and 170 deg F at sail/switch. Sail switch is UL listed.