26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)

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

Actual Filter Size – 24 3/4"w x 24 3/4" x 1"

26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 18" OR 18" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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