20" X 24" Or 24" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille- Brown [Outer Dimensions: 21.75 X 25.75] 6" Round Duct Pipe + Product Details Size -

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

This 12" X 10" end cap is constructed with 26-gauge galvanized steel

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 12" X 6" X 6"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 14" OR 14" x 26" duct opening (measured at the opening)

20" X 24" Or 24" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille- Brown [Outer Dimensions: 21.75 X 25.75] 6" Round Duct Pipe + Product Details Size -+ Product Details Size 20"w X 24"h or 24" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 25. 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