16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return the second number represents the

the second number represents the height

+ Product Details Size – 16"w X 32"h is the size for the duct opening measurement only

High Quality – High-quality rust-free

Actual Filter Size – 27 3/4"w x 11 3/4" x 1"

16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return the second number represents the+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 10" OR 10" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 9. 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