20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 875" width X 21

875" width X 21

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 20" or 20" x 8" duct opening (measured at the opening)

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

+ Product Details Size – 8" x 34" or 34" x 8" 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 w36h36 875" width X 21+ 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