34"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 35.75"W X 21.75"H] w30h30 + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 10"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 4"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

/* more inner breathing room */ border-radius: 6px

the actual front end outer dimensions are 7" in diameter

34"W X 20"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 35.75"W X 21.75"H] w30h30 + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 10"w X 32"h is the size for the duct opening measurement only + Product Details Size 4"w X 36"h is the size for the duct opening measurement only