20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are 11

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)

Designed to seamlessly integrate with T-Bar vent covers in drop ceiling setups

14" x 3" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

+ Product Details Size – 6" x 36" or 36" x 6" is the size for the duct opening measurement only

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are 11 + Product Details Perfect Fit & Easy Sizing Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)