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

actual front end outer dimensions are approximately 12 5/8" width X 18 5/8" height

undisturbed airflow

These are airflow control components made to connect to supply grilles of the drop ceiling

Solid Base Construction – Features a solid base for stable installation and reliable protection

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

30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 26" OR 26" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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