16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 22 5/8"] w30h30 + Product Details Size –

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

Adjustable airflow control - by rotating the middle disk

We pride ourselves on offering top-of-the-line products that meet the highest standards

ensuring a perfect fit

+ Product Details Size – 14"w X 20"h is the size for the duct opening measurement only

16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 22 5/8"] w30h30 + Product Details Size –+ Product Details Size 16"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 5 8" width X 22 5 8" height Actual Filter Size 15 3 4"w x 19 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.