18"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 17.75"H] Powder-Coated Some of the best features Height_16in RG1612AL Product Details Size 14

Some of the best features aren't readily apparent

+ Product Details Size – 24" x 24" is the size for the duct opening measurement only

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+ Product Details Size - 30"w X 6"h is the size for the duct opening measurement only

18"W X 16"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 19.75"W X 17.75"H] Powder Coated Some of the best features Height_16in RG1612AL Product Details Size 14 Some of the best features aren't readily apparent + Product Details Size – 24" x 24" is the size for the duct opening measurement only