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 Actual Filter Size – 13 actual front end outer RFG1818 Black Welding & Soldering

Actual Filter Size – 13 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are approximately 24 5/8" width X 22 5/8" height

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

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

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

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 Actual Filter Size – 13 actual front end outer RFG1818 Black Welding & Soldering Actual Filter Size – 13 3 4"w x 29 3 4" x 1" actual front end outer dimensions are approximately 24 5 8" width X 22 5 8" height