30" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 28 5/8"] w25h25 Design – Cubic core eggcrate

Design – Cubic core eggcrate design Offers highest airflow efficiency at almost 95%

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

The total outer size of this grille is the listed size plus plus 2 and 5/8"

+ Product Details Size – 14"w X 28"h is the size for the duct opening measurement only

30" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 28 5/8"] w25h25 Design – Cubic core eggcrate+ Product Details Size 30"w X 26"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32 5 8" width X 28 5 8" height Actual Filter Size 29 3 4"w x 25 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.