Photo 1 of Copkim 4 Pieces 4 Inch Backdraft Damper One Way Airflow Dryer Vent Backflow Preventer Duct Draft Stopper Inline Fan Vent Deflector with 2 Spring Loaded Folding Blades for Range Hoods Bathrooms Kitchen

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Photo 1 of Copkim 4 Pieces 4 Inch Backdraft Damper One Way Airflow Dryer Vent Backflow Preventer Duct Draft Stopper Inline Fan Vent Deflector with 2 Spring Loaded Folding Blades for Range Hoods Bathrooms KitchenPhoto 2 of Copkim 4 Pieces 4 Inch Backdraft Damper One Way Airflow Dryer Vent Backflow Preventer Duct Draft Stopper Inline Fan Vent Deflector with 2 Spring Loaded Folding Blades for Range Hoods Bathrooms Kitchen