14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 15 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 20" duct opening (measured at the opening)

+ Product Details Size – 6" x 28" or 28" x 6" is the size for the duct opening measurement only

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 20" x 28" OR 28" x 20" duct opening (measured at the opening)

14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 11. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum