12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in + Product Details Size -

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

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Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

+ Product Details Size – 26"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 26" or 26" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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