10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 38.5"] Compatible with Duct 10" Design – Removable face for 4 X 12 Is CRFG2028 Width_14in

Design – Removable face for cleaning and access to damper - wooden damper for airflow shutoff control

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening)

+ Product Details Size – 16"w X 18"h is the size for the duct opening measurement only

Lock and Key included

+ Product Details Size – 14" x 14" is the size for the duct opening measurement only

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 12.5" X 38.5"] Compatible with Duct 10" Design – Removable face for 4 X 12 Is CRFG2028 Width_14in Design – Removable face for cleaning and access to damper wooden damper for airflow shutoff control + Product Details Perfect Fit & Easy Sizing Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening)