16" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 8 5/8"] 18" Round Duct Pipe } /* LIST SPACING */

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Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 8

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

order a 20x14 grille

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

16" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 8 5/8"] 18" Round Duct Pipe } /* LIST SPACING */+ Product Details Size 16"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 5 8" width X 8 5 8" height High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location sidewall and ceiling Design removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your