26" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 38 5/8"] Return Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

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

+ Product Details Size – 14"w X 26"h is the size for the duct opening measurement only

3/4" - 2981 PSI

Installation – Installs directly on round & oval spiral duct - no frames

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

26" X 36" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 28 5 8" X 38 5 8"] Return Grille actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 20 5 8" width X 8 5 8" height + Product Details Size – 14"w X 26"h is the size for the duct opening measurement only