20" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood + Product Details Size - Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size - 14"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 20" or 20" x 8" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 10 5/8" height

Actual Filter Size – 23 3/4"w x 15 3/4" x 1"

20" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood + Product Details Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 14"w X 10"h is the size for the duct opening measurement only + Product Details Size – 8" x 20" or 20" x 8" is the size for the duct opening measurement only