20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 + Product Details Size –

+ Product Details Size – 8" x 22" or 22" x 8" is the size for the duct opening measurement only

The premium durable material guarantees that they will never rust or wear through

+ Product Details Size – 8" x 34" or 34" x 8" is the size for the duct opening measurement only

875" width X 21

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 + Product Details Size –+ 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