25" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 27 5/8" X 38 5/8"] 18in diameter Please check the measuring guide Suitable for all AC 8in diameter 12125SDCLNGBX

Please check the measuring guide to ensure a proper fit

actual front end outer dimensions are approximately 20 5/8" width X 28 5/8" height

+ Product Details Size - 32"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

25" X 36" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 27 5 8" X 38 5 8"] 18in diameter Please check the measuring guide Suitable for all AC 8in diameter 12125SDCLNGBX Please check the measuring guide to ensure a proper fit actual front end outer dimensions are approximately 20 5 8" width X 28 5 8" height