Photo 1 of HVAC OV 5 Inch Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades

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Photo 1 of HVAC OV 5 Inch Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding BladesPhoto 2 of HVAC OV 5 Inch Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades