16" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 24 5/8" width X 22 5/8" height

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

+ Product Details Size - 34"w X 6"h is the size for the duct opening measurement only

efficient airflow

Actual Filter Size – 11 3/4"w x 11 3/4" x 1"

16" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 24 5 8" width X 22 5 8" height + Product Details Size 16"w X 18"h is the size for the duct opening measurement only