16" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –

+ Product Details Size – 6" x 24" or 24" x 6" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

Made from high-quality aluminum

and waste gases transmission lines

+ Product Details Size - 32"w X 32"h is the size for the duct opening measurement only

16" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 20" OR 20" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 19. 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