30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille + Product Details Size –

+ Product Details Size – 24"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 5 3/4" x 1"

+ Product Details Outer dimensions: 21

Designed with individually adjustable curved blades

+ Product Details Size – 10" x 18" or 18" x 10" is the size for the duct opening measurement only

30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Floor Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 16" OR 16" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 15. 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