28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in accordion-container { border: 1px solid

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 14" OR 14" x 24" duct opening (measured at the opening)

Made from high-quality aluminum

actual front end outer dimensions are approximately 36 5/8" width X 18 5/8" height

28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in accordion-container { border: 1px solid+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 33. 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