12"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 15.875"H] d + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246

+ Product Details Size – 16"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 36" or 36" x 6" duct opening (measured at the opening)

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Actual Front End Outer Dimensions Are 12" Width X 6" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

+ Product Details Size - 20"w X 24"h is the size for the duct opening measurement only

12"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 15.875"H] d + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246 + Product Details Size – 16"w X 22"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 6" x 36" or 36" x 6" duct opening (measured at the opening)