20" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 22 5/8" X 32 5/8"] Color_R-4.2 Yellow Design – Removable door/face for RG1620AL Quality Packaging carefully packaged 8 Feet Long

Design – Removable door/face for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size - The listed 8" diameter refers specifically to the size of the duct opening

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height -

20" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 22 5 8" X 32 5 8"] Color_R 4.2 Yellow Design – Removable door face for RG1620AL Quality Packaging carefully packaged 8 Feet Long Design – Removable door face for easy filter change & cleaning uses a 1" thick filter + Product Details Size The listed 8" diameter refers specifically to the size of the duct opening