25" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 27 5/8" X 24 5/8"] 6" Round Duct Pipe Actual Filter Size – 29 4 X 12 Is CRFG2028 Width_14in

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

Round-neck-to-square-face construction results in 360 degree air diffusion pattern similar to a full round diffuser

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

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+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

25" X 22" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 27 5 8" X 24 5 8"] 6" Round Duct Pipe Actual Filter Size – 29 4 X 12 Is CRFG2028 Width_14in Actual Filter Size – 29 3 4"w x 15 3 4" x 1" Round neck to square face construction results in 360 degree air diffusion pattern similar to a full round diffuser