28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille this grille offers a seamless

this grille offers a seamless blend of functionality and aesthetics

Quality Packaging - Carefully Shrink Wrapped with Cardboard Backing to Prevent Damage in Shipment

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille this grille offers a seamless+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 36" OR 36" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 35. 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