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![Photo 1 of [Upgraded] Hon&Guan 6 Inch Backdraft Damper Draft Blocker, One-Way Airflow Duct Damper 6 Inch Ducting Insert Backflow Preventer Inline Fan Vent Deflector-Black](https://images-na.ssl-images-amazon.com/images/I/61k9aE41SBL.jpg)