26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

+ Product Details Size - The listed 6" diameter refers specifically to the size of the duct opening

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It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 22" OR 22" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 21. 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