18" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 28 5/8"] Color_Black + Product Details Size – Product Details Size 14 Material_Anodized Aluminum LR164

+ Product Details Size – 16"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 18"h is the size for the duct opening measurement only

+ Product Description Upgrade your HVAC system with our 6" Round Air Vent Supply Grille

Installation Location – Wall or door mount - door thickness up to 32mm - anodised finish - smooth & beautiful

Actual Filter Size – 29 3/4"w x 17 3/4" x 1"

18" X 26" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 28 5 8"] Color_Black + Product Details Size – Product Details Size 14 Material_Anodized Aluminum LR164 + Product Details Size – 16"w X 24"h is the size for the duct opening measurement only + Product Details Size 34"w X 18"h is the size for the duct opening measurement only