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![View 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)
![View 2 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%2F1052055600%2FQUI5vL5bLpgp5e49ul97m.jpeg?alt=media&token=819006c3-7919-4ec9-b57e-0a6a1f95c825)