12" x 10" or 10" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 12.5"] Powder-Coated + Product Details Size – LO246 Product Details Size 32 Compatible with Duct 4"

+ Product Details Size – 10" X 4" is the size for the duct opening (floor/vent hole) measurement only

+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

Control Your Airflow on drop ceiling grilles

10"w X 2"h Is The Size For The Duct Opening Measurement Only

12" x 10" or 10" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 14.5" X 12.5"] Powder Coated + Product Details Size – LO246 Product Details Size 32 Compatible with Duct 4" + Product Details Size – 10" X 4" is the size for the duct opening (floor vent hole) measurement only + Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only