10"w X 8"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 9.75"H] w12h12 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 9 3/4" x 1"

+ Product Details Size – 25"w X 26"h is the size for the duct opening measurement only

Choose our premium HVAC grilles and registers for long-lasting durability

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10"w X 8"h [Duct Opening] 1 Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 9.75"H] w12h12 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 20"w X 8"h is the size for the duct opening measurement only Actual Filter Size – 7 3 4"w x 9 3 4" x 1"