18"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 15.875"H] Compatible With Duct 6in + Product Details Perfect Fit RG1620AL Quality Packaging carefully packaged 8 Feet Long

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 8" OR 8" x 32" duct opening (measured at the opening)

+ Product Details Size - 30"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only

18"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 15.875"H] Compatible With Duct 6in + Product Details Perfect Fit RG1620AL Quality Packaging carefully packaged 8 Feet Long + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening) + Product Details Perfect Fit & Easy Sizing Designed for a 32" x 8" OR 8" x 32" duct opening (measured at the opening)