4" X 18" Or 18" X 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 19.75] 10" Diameter Actual Filter Size – 9

Actual Filter Size – 9 3/4"w x 27 3/4" x 1"

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 10"w X 14"h is the size for the duct opening measurement only

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+ Product Details Size - 12"w X 6"h X 2"d (for duct opening measurement only)

4" X 18" Or 18" X 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 19.75] 10" Diameter Actual Filter Size – 9+ Product Details Size 4"w X 18"h or 18" x 4" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 19. 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