12" x 8" or 8" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 10.5"] Compatible With Duct 8in Actual Filter Size – 24 FG1836 HP-1 Product Details Size 20 ceiling

Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 10" duct openings

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12" x 8" or 8" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 14.5" X 10.5"] Compatible With Duct 8in Actual Filter Size – 24 FG1836 HP 1 Product Details Size 20 ceiling Actual Filter Size – 24 3 4"w x 17 3 4" x 1" actual front end outer dimensions are approximately 30 5 8" width X 24 5 8" height