30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size –

+ Product Details Size – 16" x 30" or 30" x 16" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 16" or 16" x 12" duct opening (measured at the opening)

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

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

+ 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 + Product Details Size –+ 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