28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter + Product Details Size –

+ Product Details Size – 20" x 32" or 32" x 20" is the size for the duct opening measurement only

+ Product Details Size – 12" x 32" or 32" x 12" is the size for the duct opening measurement only

Filter Size - 21

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28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter + Product Details Size –+ 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