Photo 1 of Aluminum 1-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser - 6x12-Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper-[Front Grille Size:7.6x13.6"][Duct Hole Size:6"x12"]

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Photo 1 of Aluminum 1-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser - 6x12-Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper-[Front Grille Size:7.6x13.6"][Duct Hole Size:6"x12"]