Photo 1 of PATIKIL 4 Inch Backdraft Damper Control Valve, 2 Pcs Duct Manual Volume Adjustment Airflow Ducting for Fan Airflow, Dryer Vent, Range Hood, White

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Photo 1 of PATIKIL 4 Inch Backdraft Damper Control Valve, 2 Pcs Duct Manual Volume Adjustment Airflow Ducting for Fan Airflow, Dryer Vent, Range Hood, WhitePhoto 2 of PATIKIL 4 Inch Backdraft Damper Control Valve, 2 Pcs Duct Manual Volume Adjustment Airflow Ducting for Fan Airflow, Dryer Vent, Range Hood, White