18" X 30" Steel Return Air Filter Grille for 1" Filter - Fixed Hinge - [Outer Dimensions: 20 5/8" X 32 5/8"] Aluminum actual front end outer dimensions VF-WB 2x12 PB our damper helps create 6" Round Duct Pipe

actual front end outer dimensions are approximately 26 5/8" width X 26 5/8" height

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

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+ Product Details Size – 26"w X 16"h is the size for the duct opening measurement only

18" X 30" Steel Return Air Filter Grille for 1" Filter Fixed Hinge [Outer Dimensions: 20 5 8" X 32 5 8"] Aluminum actual front end outer dimensions VF WB 2x12 PB our damper helps create 6" Round Duct Pipe actual front end outer dimensions are approximately 26 5 8" width X 26 5 8" height + Product Details Size 22"w X 10"h is the size for the duct opening measurement only