Photo 1 of Aluminum 4-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser- 18 x 18-Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper-[Front Grille Size:19.6"x19.6"][Duct Hole Size:18"x18"]

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Photo 1 of Aluminum 4-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser- 18 x 18-Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper-[Front Grille Size:19.6"x19.6"][Duct Hole Size:18"x18"]Photo 2 of Aluminum 4-Way Vent Cover: Adjustable Curved Blade Air Supply Diffuser- 18 x 18-Plastic Seal for Tight Fit, Quiet Air Flow, Multi-Shutter Damper-[Front Grille Size:19.6"x19.6"][Duct Hole Size:18"x18"]