12" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 28 5/8"] 18in diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

actual front end outer dimensions are approximately 24 5/8" width X 14 5/8" height

Design – Removable door/face for easy filter change & cleaning - uses a 1" thick filter

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12" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 28 5/8"] 18in diameter Actual Filter Size – 21+ Product Details Size 12"w X 26"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 28 5 8" height Actual Filter Size 11 3 4"w x 25 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter