30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core actual front end outer dimensions

actual front end outer dimensions are approximately 21 5/8" width X 33 5/8" height

it ensures long-lasting performance in both residential and commercial settings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening)

The Contempo slotted Grate

Slim Sliding Metal Damper To Control and Adjust Airflow

30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 28" OR 28" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 30. 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