40"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 41.875"W X 17.875"H] w28h28 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

Auto Switch On Sensor: Yes

+ Product Description Introducing our High-Quality Copper Coil

actual front end outer dimensions are approximately 12 5/8" width X 14 5/8" height

+ Product Details Size - 28"w X 10"h X 2"d (for duct opening measurement only)

40"W X 16"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 41.875"W X 17.875"H] w28h28 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only Auto Switch On Sensor: Yes