12"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 9.875"H] Curved Blade Steel 875" width X 13 4 X 12 Is CRFG2028 Width_14in

875" width X 13

+ Product Details Size - 10"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 30 5/8" height

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

+ Product Details Size – 24"w X 8"h is the size for the duct opening measurement only

12"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 9.875"H] Curved Blade Steel 875" width X 13 4 X 12 Is CRFG2028 Width_14in 875" width X 13 + Product Details Size 10"w X 8"h is the size for the duct opening measurement only