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 – 13 4 X 12 Is CRFG2028 Width_14in

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

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

Crafted from solid stamped steel

+ 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

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 – 13 4 X 12 Is CRFG2028 Width_14in Actual Filter Size – 13 3 4"w x 29 3 4" x 1" actual front end outer dimensions are approximately 30 5 8" width X 24 5 8" height