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![Photo 1 of [Upgraded] Hon&Guan 4 Inch Backdraft Damper, One-Way Airflow Duct Damper 4 Inch Ducting Insert Backflow Preventer Duct Draft Blocker.](https://firebasestorage.googleapis.com/v0/b/nellishr-cbba0.appspot.com/o/processing-photos%2F1039335540%2FL3F6RuT3VsOL_5JUUKANe.jpeg?alt=media&token=66cefe5d-f32c-498d-ba17-ed1d940e57f2)
![Photo 1 of [Upgraded] Hon&Guan 4 Inch Backdraft Damper, One-Way Airflow Duct Damper 4 Inch Ducting Insert Backflow Preventer Duct Draft Blocker.](https://images-na.ssl-images-amazon.com/images/I/61RLSI+pRYL.jpg)
![Photo 3 of [Upgraded] Hon&Guan 4 Inch Backdraft Damper, One-Way Airflow Duct Damper 4 Inch Ducting Insert Backflow Preventer Duct Draft Blocker.](https://firebasestorage.googleapis.com/v0/b/nellishr-cbba0.appspot.com/o/processing-photos%2F1039335540%2FpaOs5Af6ZQVAvE9UCdCsq.jpeg?alt=media&token=29469555-fc3a-45df-ac72-553dd6ae0c32)