20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening)

Sleek Design – The clear and unobtrusive design ensures it blends seamlessly with any home

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

Built with rust-resistant aluminum and a scratch-resistant powder-coated finish

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 34" OR 34" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 33. 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