12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 6" Diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 18 5/8" width X 14 5/8" height -

actual front end outer dimensions are approximately 31

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

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 6" Diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 18 5 8" width X 14 5 8" height actual front end outer dimensions are approximately 31