24" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 26 5/8" X 16 5/8"] Black + Product Details Size - MFFG810-1 Actual Filter Size 9 flat stamped steel

+ Product Details Size - 34"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 20" OR 20" X 14" duct opening (measured at the opening)

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

[Outer Dimensions: 32

24" X 14" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 26 5 8" X 16 5 8"] Black + Product Details Size MFFG810 1 Actual Filter Size 9 flat stamped steel + Product Details Size 34"w X 30"h is the size for the duct opening measurement only actual front end outer dimensions are 15