Photo 1 of 16" x 16" Duct Hole Aluminum 4-Way Ceiling/Wall Vent Cover: Adjustable Curved Blade Air Supply Diffuser, Multi-Shutter Damper, Plastic Seal for Tight Fit, Quiet Air Flow, 17.6" x 17.6" Face

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Photo 1 of 16" x 16" Duct Hole Aluminum 4-Way Ceiling/Wall Vent Cover: Adjustable Curved Blade Air Supply Diffuser, Multi-Shutter Damper, Plastic Seal for Tight Fit, Quiet Air Flow, 17.6" x 17.6" FacePhoto 2 of 16" x 16" Duct Hole Aluminum 4-Way Ceiling/Wall Vent Cover: Adjustable Curved Blade Air Supply Diffuser, Multi-Shutter Damper, Plastic Seal for Tight Fit, Quiet Air Flow, 17.6" x 17.6" Face