Photo 1 of DIRBUY 2 Pack Backdraft Damper - 6 Inch One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades - Silver Vent Blockers - Backflow Preventer for 6 Inch Duct Dryer Vent Hose, Range Hoods

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Photo 1 of DIRBUY 2 Pack Backdraft Damper - 6 Inch One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades - Silver Vent Blockers - Backflow Preventer for 6 Inch Duct Dryer Vent Hose, Range HoodsPhoto 2 of DIRBUY 2 Pack Backdraft Damper - 6 Inch One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades - Silver Vent Blockers - Backflow Preventer for 6 Inch Duct Dryer Vent Hose, Range Hoods