28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions Product Details Size 30 LO1828 12in diameter

actual front end outer dimensions are approximately 38 5/8" width X 20 5/8" height -

Actual Filter Size – 35 3/4"w x 31 3/4" x 1"

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

+ Product Details Size - 30"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions Product Details Size 30 LO1828 12in diameter actual front end outer dimensions are approximately 38 5 8" width X 20 5 8" height Actual Filter Size – 35 3 4"w x 31 3 4" x 1"