20" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 22 5/8" X 26 5/8"] Copper Coil-Insulated Line Set + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 18" duct opening (measured at the opening)

Actual Filter Size – 33 3/4"w x 25 3/4" x 1"

our Butterfly Damper simplifies the process of managing airflow

Filter Size - 19

installation is a breeze

20" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 22 5/8" X 26 5/8"] Copper Coil-Insulated Line Set + Product Details Perfect Fit+ Product Details Size 20"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 26 5 8" height Actual Filter Size 19 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.