28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter and sound level range of

and sound level range of NC 25 to 35

actual front end outer dimensions are approximately 24 5/8" width X 26 5/8" height

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28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter and sound level range of+ 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