14" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 36 5/8"] Insulated Line Set + Product Details Size - Height_16in RG1612AL Product Details Size 14

+ Product Details Size - 18"w X 24"h is the size for the duct opening measurement only

with actual outer dimensions of 18

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

Actual Filter Size – 7 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are approximately 38 5/8" width X 32 5/8" height -

14" X 34" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 16 5 8" X 36 5 8"] Insulated Line Set + Product Details Size Height_16in RG1612AL Product Details Size 14 + Product Details Size 18"w X 24"h is the size for the duct opening measurement only with actual outer dimensions of 18