12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 please note that the total

please note that the total outer dimensions of the grille measure 14" in diameter

+ Product Details Size - 12"w X 26"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 6" duct openings

+ Product Details Size – 8"w X 14"h is the size for the duct opening measurement only

Quality Packaging – Every part is hand inspected for quality before it is packaged

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 please note that the total+ 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