26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height

The smooth

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 18" OR 18" x 32" duct opening (measured at the opening)

Actual Filter Size – 31 3/4"w x 31 3/4" x 1"

26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 19. 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