20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 14 5/8" height -

+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

preventing tampering and maintaining consistent temperature settings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 8" OR 8" x 26" duct opening (measured at the opening)

+ Product Details Size - 12"w X 12"h is the size for the duct opening measurement only

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 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