12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] White + Product Details Size –

+ Product Details Size – 12" X 24" is the size for the drywall opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

actual front end outer dimensions are approximately 22 5/8" width X 10 5/8" height

+ Product Details Size - 20"w X 22"h is the size for the duct opening measurement only

12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] White + Product Details Size –+ Product Details Size 12"w X 18"h or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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