8"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 19.75"H] 6" Diameter + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 32"h is the size for the duct opening measurement only

and sound level range of NC 25 to 35

+ Product Details Size - 20"w X 34"h X 2"d (for duct opening measurement only)

+ Product Details Size – 26"w X 30"h is the size for the duct opening measurement only

8"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 9.75"W X 19.75"H] 6" Diameter + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 25"w X 26"h is the size for the duct opening measurement only + Product Details Size 34"w X 32"h is the size for the duct opening measurement only