25" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 27 5/8" X 22 5/8"] 8" Diameter Insulation – A thick blanket

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

actual front end outer dimensions are approximately 16 5/8" width X 28 5/8" height

Design – Rigid gauge built for durability and long life in mind

Actual Filter Size – 11 3/4"w x 23 3/4" x 1"

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

25" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 27 5/8" X 22 5/8"] 8" Diameter Insulation – A thick blanket+ Product Details Size 25"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27 5 8" width X 22 5 8" height Actual Filter Size 24 3 4"w x 19 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.