22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter and lay it flat in

and lay it flat in the grid

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening)

actual front end outer dimensions are approximately 16 5/8" width X 24 5/8" height

actual front end outer dimensions are approximately 19

22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter and lay it flat in+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 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