14" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 16 5/8" X 26 5/8"] Powder Coated Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

Premium Airflow Efficiency - High-performance cube core eggcrate design allows 95% airflow efficiency

See our separate listing for Butterfly Dmaper to Control Airflow

+ Product Details Size – 26"w X 14"h is the size for the duct opening measurement only

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14" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 16 5/8" X 26 5/8"] Powder Coated Actual Filter Size – 21+ Product Details Size 14"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 26 5 8" height Actual Filter Size 13 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.