24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper 40"w X 16"h Is The

40"w X 16"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size – 30"w X 30"h is the size for the duct opening measurement only

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+ Product Details Size – 6" x 26" or 26" x 6" is the size for the duct opening measurement only

24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper 40"w X 16"h Is The+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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