25" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 27 5/8" X 27 5/8"] Filter Grille actual front end outer dimensions Drop Ceilings / Aluminum The set includes a FG1836 HP-1

actual front end outer dimensions are approximately 27 5/8" width X 18 5/8" height

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 338 5/8" height

+ Product Details Size – 10"w X 18"h is the size for the duct opening measurement only

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25" X 25" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 27 5 8" X 27 5 8"] Filter Grille actual front end outer dimensions Drop Ceilings Aluminum The set includes a FG1836 HP 1 actual front end outer dimensions are approximately 27 5 8" width X 18 5 8" height actual front end outer dimensions are approximately 22 5 8" width X 14 5 8" height