18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size -

+ Product Details Size - 16"w X 25"h is the size for the duct opening measurement only

With a 6" diameter for the duct opening measurement

optimizing performance and energy efficiency

Powder-Coat Finish – smooth

18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 32" OR 32" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 31. 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