24" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 26 5/8" X 18 5/8"] Insulated Line allow you to customize airflow

allow you to customize airflow direction with ease

+ Product Details Size - 18"w X 22"h is the size for the duct opening measurement only

Looks like it was just waxed

+ Product Details Size - 25"w X 34"h is the size for the duct opening measurement only

production and finish on all products

24" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 26 5/8" X 18 5/8"] Insulated Line allow you to customize airflow+ Product Details Size 24"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 26 5 8" width X 18 5 8" height Actual Filter Size 23 3 4"w x 15 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.