10"W X 34"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 35.75"H] Aluminum - Cube Core + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 16"h is the size for the duct opening measurement only

during winter

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

10"W X 34"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 11.75"W X 35.75"H] Aluminum Cube Core + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 4"w X 30"h is the size for the duct opening measurement only + Product Details Size 30"w X 16"h is the size for the duct opening measurement only