30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 + Product Details Size -

+ Product Details Size - 16"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 20"h is the size for the duct opening measurement only

Size - 10"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 8" or 8" x 6" is the size for the duct opening measurement only

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

30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 17. 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