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The Resideo S688A1007/U is a sail switch designed to activate an electronic air cleaner, humidifier, or other equipment based on airflow from the system fan. It is mounted in the return air duct where the sail is positioned in the direct path of the airflow.
This sail switch provides reliable operation with low air velocity, engaging at two hundred fifty feet per minute (fpm) and breaking at seventy-five fpm.
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