Photo 1 of 12" x 12" Duct Hole [13.6" x 13.6" Face] Aluminum 1-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser - Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper

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Photo 1 of 12" x 12" Duct Hole [13.6" x 13.6" Face] Aluminum 1-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser - Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter DamperPhoto 2 of 12" x 12" Duct Hole [13.6" x 13.6" Face] Aluminum 1-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser - Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper