16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Actual Filter Size – 27

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 16" OR 16" x 26" duct opening (measured at the opening)

High Quality – High-quality rust-free

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening)

the second number represents the height

16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Actual Filter Size – 27+ 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