28" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 30 5/8"] Insulated Line Complies with industry standards of

Complies with industry standards of USA: ASTM D-882

The total outer size of this grille is the listed size plus 2

or just adding updated elements to your current home

Multi Angled Fan Pattern Fins For Multi Directional AIr Distribution Throughout The Entire Room

Engineered with precision and designed to perfection

28" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 30 5/8"] Insulated Line Complies with industry standards of+ Product Details Size 28"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 30 5 8" height Actual Filter Size 27 3 4"w x 27 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.