10"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 27.75"H] Copper Coil-Insulated Line Set + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

& EN 13180 standards

10"W X 26"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 11.75"W X 27.75"H] Copper Coil Insulated Line Set + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 34"w X 14"h is the size for the duct opening measurement only + Product Details Size 10"w X 28"h is the size for the duct opening measurement only