18" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 26 5/8"] 18in diameter improves airflow

improves airflow

Whether you're restoring an old Victorian or craftsman style home

actual front end outer dimensions are approximately 26 5/8" width X 16 5/8" height

actual front end outer dimensions are approximately 15

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18" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 26 5/8"] 18in diameter improves airflow+ Product Details Size 18"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 26 5 8" height Actual Filter Size 17 3 4"w x 23 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.