16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel If your duct opening is

If your duct opening is 14 inches in diameter

Constructed from durable

please note that the total outer dimensions of the grille measure 12" in diameter

Actual Front End Outer Dimensions Are 7

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 12" duct openings

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel If your duct opening is+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 26" OR 26" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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