28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size –

+ Product Details Size – 8"w X 8"h is the size for the duct opening measurement only

Center Core is Removable for Easy Access and Maintence

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 16" OR 16" x 30" duct opening (measured at the opening)

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

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28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 26" OR 26" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 25. 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