36"W X 12"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 37.75"W X 13.75"H] w22h22 + Product Details Size - SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe

+ Product Details Size - 16"w X 20"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

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Installation Location – Sidewall or ceiling

Every part is hand inspected for quality before it is packaged

36"W X 12"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 37.75"W X 13.75"H] w22h22 + Product Details Size SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe + Product Details Size 16"w X 20"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