36" X 14" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 16 5/8"] 8" Diameter + Product Details Size – w6h6 actual front end outer MFFG410-1

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height

+ Product Details Size – 25"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 16"h is the size for the duct opening measurement only

36" X 14" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 38 5 8" X 16 5 8"] 8" Diameter + Product Details Size – w6h6 actual front end outer MFFG410 1 + Product Details Size – 12"w X 24"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 26 5 8" width X 8 5 8" height