18" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 28 5/8"] Color_Black actual front end outer dimensions RFG3024 Black HP const content item Hi-Lo Oval Stack Head

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height -

+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

75" width X 19

Actual Filter Size – 31 3/4"w x 33 3/4" x 1"

+ Product Details Size – 15" Wooden Corner Baseboard Grille

18" X 26" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 28 5 8"] Color_Black actual front end outer dimensions RFG3024 Black HP const content item Hi Lo Oval Stack Head actual front end outer dimensions are approximately 32 5 8" width X 18 5 8" height + Product Details Size 14"w X 18"h is the size for the duct opening measurement only