26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size -

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

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+ Product Details Size – 22"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 24" OR 24" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 23. 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