10" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 20 5/8"] Fixed Blades with Damper + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers

+ Product Details Size – 10"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 32"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are 15

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

10" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 12 5 8" X 20 5 8"] Fixed Blades with Damper + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers + Product Details Size – 10"w X 28"h is the size for the duct opening measurement only + Product Details Size – 16"w X 32"h is the size for the duct opening measurement only