30" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 32 5/8" X 22 5/8"] w20h20 + Product Details Size – Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size – 30"w X 12"h is the size for the duct opening measurement only

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size - 24"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height

30" X 20" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 32 5 8" X 22 5 8"] w20h20 + Product Details Size – Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size – 30"w X 12"h is the size for the duct opening measurement only Design – Fixed hinged for easy filter change & cleaning uses a 1" thick filter