30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille + Product Details Size –

+ Product Details Size – 8" x 34" or 34" x 8" is the size for the duct opening measurement only

+ Product Details Size – 6" x 20" or 20" x 6" is the size for the duct opening measurement only

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Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 7. 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