12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 18.5"] Aluminum Adjustable Curved Blade Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 35 3/4" x 1"

+ Product Details Size – 20" x 26 or 26" x 20" is the size for the duct opening measurement only

providing the flexibility to match specific ventilation requirements or personal comfort levels

Filter Size - 25

12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 18.5"] Aluminum Adjustable Curved Blade Actual Filter Size – 31+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 16" or 16" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 15. 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