12" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 13.75] 8 Feet Long Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 13 3/4" x 1"

+ Product Details Size – 10" X 4" is the opening (vent hole) dimension - actual size is approx

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Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

12" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 13.75] 8 Feet Long Actual Filter Size – 11+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 13. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully shrink