6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 10.5"] Return Grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246

+ Product Details Size – 20"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are 9

actual front end outer dimensions are approximately 9

Actual Filter Size – 15 3/4"w x 24 3/4" x 1"

+ Product Details Size – 34"w X 18"h is the size for the duct opening measurement only

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 10.5"] Return Grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246 + Product Details Size – 20"w X 30"h is the size for the duct opening measurement only actual front end outer dimensions are 9