16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 11 3/4" x 1"

+ Product Details Size – 20" x 30" or 30" x 20" is the size for the duct opening measurement only

Designed for optimal airflow and lasting durability

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

Design – Easy unrestricted air flow for your HVAC system

16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 25+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 12" OR 12" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 11. 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