14"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 15.75"W X 19.75"H] w6h6 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

+ Product Details Size - 26"w X 36"h is the size for the duct opening measurement only

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+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

14"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 15.75"W X 19.75"H] w6h6 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only + Product Details Size 26"w X 36"h is the size for the duct opening measurement only