20" X 26" Or 26" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 27.75] 3-Pack Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

This 20" X 12" end cap is constructed with 26-gauge galvanized steel

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

20" X 26" Or 26" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 27.75] 3-Pack Actual Filter Size – 13+ Product Details Size 20"w X 26"h or 26" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 27. 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