40" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 42 5/8" X 12 5/8"] Fixed Blades actual front end outer dimensions RFG3024 Black HP const content item Hi-Lo Oval Stack Head

actual front end outer dimensions are approximately 24 5/8" width X 24 5/8" height

+ Product Details Size – 14"w X 28"h is the size for the duct opening measurement only

5" - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 27 5/8" height

40" X 10" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 42 5 8" X 12 5 8"] Fixed Blades actual front end outer dimensions RFG3024 Black HP const content item Hi Lo Oval Stack Head actual front end outer dimensions are approximately 24 5 8" width X 24 5 8" height + Product Details Size – 14"w X 28"h is the size for the duct opening measurement only