16" X 30" or 30" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 31.75] w34h34 + Product Details Size -

+ Product Details Size - 40"W X 6"H is (for duct opening measurement only)

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

+ Product Details Outer dimensions: 21

+ Product Details Size & Compatibility – The 8" stick-on Side take-off is compatible with duct 8"

The door can be easily removed with a slight squeeze

16" X 30" or 30" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 31.75] w34h34 + Product Details Size -+ Product Details Size 16"w X 30"h or 30" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 31. 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