20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 6" or 6" x 14" duct opening (measured at the opening)

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high-impact clear plastic for long-lasting performance

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

Multi-shutter damper with handle operator to adjust air flow

20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 8" OR 8" 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 7. 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