18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum Durable Construction – Made from

Durable Construction – Made from high-quality

Just run your finger along the edge of the top plate and you’ll find a smooth finished surface

Powder-coat finish – smooth

+ Product Details Size - 10"w X 16"h is the size for the duct opening measurement only

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum Durable Construction – Made from+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 27. 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