30" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 32 5/8" X 16 5/8"] Brown 9% Pure Copper meeting ASTM

9% Pure Copper meeting ASTM B280 standards

Crafted with a solid steel body

Universal Fit – Dimensions of 6-3/8" wide x 3-1/2" high x 3" deep make it compatible with most standard thermostat models

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

30" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 32 5/8" X 16 5/8"] Brown 9% Pure Copper meeting ASTM+ Product Details Size 30"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32 5 8" width X 16 5 8" height Actual Filter Size 29 3 4"w x 13 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.