34"W X 30"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 35.75"W X 31.75"H] 18" Round Duct Pipe + Product Details Size – RFGF1212 Rigid Design Noise Free Oval to Round 90-Degree Boot

+ Product Details Size – 24"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 18"h is the size for the duct opening measurement only

Design – Heavy gauge steel

[Outer Dimensions: 14

With precise measurements and easy installation

34"W X 30"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 35.75"W X 31.75"H] 18" Round Duct Pipe + Product Details Size – RFGF1212 Rigid Design Noise Free Oval to Round 90 Degree Boot + Product Details Size – 24"w X 18"h is the size for the duct opening measurement only + Product Details Size 10"w X 18"h is the size for the duct opening measurement only