12"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 19.75"H] w28h28 + Product Details Size – Height_16in RG1612AL Product Details Size 14

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of galvanized sheet metal oval stack head with collar is 10" X 6" - 7" and it is compatible with Duct 7"

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+ Product Details Size – 22" x 22" is the size for the duct opening measurement only

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

12"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 13.75"W X 19.75"H] w28h28 + Product Details Size – Height_16in RG1612AL Product Details Size 14 + Product Details Size – 30"w X 14"h is the size for the duct opening measurement only + Product Details Size & Compatibility – The size of galvanized sheet metal oval stack head with collar is 10" X 6" 7" and it is compatible with Duct 7"