28" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 26 5/8"] w24h24 thanks to counter-sunk screw holes

thanks to counter-sunk screw holes and included screws

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

Design – Easy unrestricted airflow for your HVAC system - 50° angled to provide maximum airflow

Filter Size - 23

28" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 26 5/8"] w24h24 thanks to counter-sunk screw holes+ Product Details Size 28"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 26 5 8" height Actual Filter Size 27 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.