18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening)

Actual Filter Size – 19 3/4"w x 15 3/4" x 1"

+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only

Actual Front End Outer Dimensions Are 12" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

providing a stylish and practical solution for ventilation

18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening) Actual Filter Size – 19 3 4"w x 15 3 4" x 1"