16" X 18" or 18" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 19.75] Brown actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 38 5/8" height -

10"w X 3"h Is The Size For The Duct Opening Measurement Only

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

as the fitting has an opening of 1/2"

the kit features pre-flared ends with nuts

16" X 18" or 18" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 19.75] Brown actual front end outer dimensions+ Product Details Size 16"w X 18"h or 18" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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