16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel Ideal for Walls & Ceilings:

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

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

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Actual Front End Outer Dimensions Are 7

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

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel Ideal for Walls & Ceilings:+ 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