6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 38.5"] Adjustable Return Actual Filter Size – 13 4 X 12 Is CRFG2028 Width_14in

Actual Filter Size – 13 3/4"w x 21 3/4" x 1"

allowing unrestricted airflow for optimal HVAC performance

actual front end outer dimensions are approximately 18 5/8" width X 22 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 22" or 22" x 12" duct opening (measured at the opening)

Made from high-grade stamped steel

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 38.5"] Adjustable Return Actual Filter Size – 13 4 X 12 Is CRFG2028 Width_14in Actual Filter Size – 13 3 4"w x 21 3 4" x 1" allowing unrestricted airflow for optimal HVAC performance