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The Model 502 is an economy rear flanged vertical mount automatic exhaust shutter. It is designed to allow horizontal airflow in one direction and to prevent reverse airflow while providing protection from environmental elements when the airflow stops. The blades open with airflow and close by gravity when the fan shuts down. Ideal for direct-drive or belt-driven exhaust fans. Do not use with vane axial or tube axial fans.<br><br><b>MADE IN THE USA</b>

Low Velocity Exhaust Shutter 24&quot; - 502-STD-24

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