24" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 26 5/8" X 20 5/8"] w16h16 + Product Details Size - Product Details Size 14 Material_Anodized Aluminum LR164

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

providing the flexibility to match specific ventilation requirements or personal comfort levels

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+ Product Details Size – 28"w X 30"h is the size for the duct opening measurement only

24" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame * Filter Included * [Outer Dimensions: 26 5 8" X 20 5 8"] w16h16 + Product Details Size Product Details Size 14 Material_Anodized Aluminum LR164 + Product Details Size 28"w X 20"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 10 5 8" width X 38 5 8" height