Photo 1 of 16.5"w X 10.7"h Gable Vent, Hon&Guan Aluminum Alloy Attic Vent Wall Vent for Houses, Shed Vents Air Return Vent Cover for Interior Doors Ceiling [Outer Dimensions: 18”x 12”h]. 18" x 12" Aluminum Alloy

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Photo 1 of 16.5"w X 10.7"h Gable Vent, Hon&Guan Aluminum Alloy Attic Vent Wall Vent for Houses, Shed Vents Air Return Vent Cover for Interior Doors Ceiling [Outer Dimensions: 18”x 12”h]. 18" x 12" Aluminum AlloyPhoto 2 of 16.5"w X 10.7"h Gable Vent, Hon&Guan Aluminum Alloy Attic Vent Wall Vent for Houses, Shed Vents Air Return Vent Cover for Interior Doors Ceiling [Outer Dimensions: 18”x 12”h]. 18" x 12" Aluminum AlloyPhoto 3 of 16.5"w X 10.7"h Gable Vent, Hon&Guan Aluminum Alloy Attic Vent Wall Vent for Houses, Shed Vents Air Return Vent Cover for Interior Doors Ceiling [Outer Dimensions: 18”x 12”h]. 18" x 12" Aluminum Alloy