20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

[Outer Dimensions: 50

actual front end outer dimensions are approximately 29

actual front end outer dimensions are 19" Width X 11" Height

75" width X 15

20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter Actual Filter Size – 23+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 18" OR 18" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 17. 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