36"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 13.875"H] Color_Aluminum + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 26"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 8"h is the size for the duct opening measurement only

this guard fits almost any thermostat and blends seamlessly into any setting

+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

[Outer Dimensions: 50

36"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 37.875"W X 13.875"H] Color_Aluminum + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 26"w X 18"h is the size for the duct opening measurement only + Product Details Size 14"w X 8"h is the size for the duct opening measurement only