28" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 38 5/8"] Powder-Coated Actual Filter Size – 7 4 X 12 Is CRFG2028 Width_14in

Actual Filter Size – 7 3/4"w x 35 3/4" x 1"

Horizontal performance assures confident use of cooling temperature differential of 30 degrees Fahrenheit and greater

actual front end outer dimensions are approximately 24 5/8" width X 27 5/8" height

actual front end outer dimensions are approximately 24 5/8" width X 26 5/8" height

+ Product Details Size – 34"w X 36"h is the size for the duct opening measurement only

28" X 36" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 30 5 8" X 38 5 8"] Powder Coated Actual Filter Size – 7 4 X 12 Is CRFG2028 Width_14in Actual Filter Size – 7 3 4"w x 35 3 4" x 1" Horizontal performance assures confident use of cooling temperature differential of 30 degrees Fahrenheit and greater