Asail switch is a type of provingswitch used for the detection of flow and is actuated on or off in response to the flow or non-flow of a fluid such as air or water.[1] A sail switch typically operates through the use of a paddle (the sail) which gets displaced due to the force of the fluid moving over it.
A sail switch might be used to protect a fan-forced pellet stove, a central heating system, or an electric heating element from being energized before the air flow from the blower is established.[2] Sail switches might also be used to alarm if a ventilation fan in a hazardous location fails, causing air flow to stop. For some HVAC systems, a sail switch can activate an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan.[3]
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