16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" The first number in a

The first number in a grille size represents the width

Actual Filter Size – 33 3/4"w x 7 3/4" x 1"

Actual Filter Size – 21 3/4"w x 27 3/4" x 1"

Actual Filter Size – 19 3/4"w x 23 3/4" x 1"

+ Product Details Size - 25"w X 14"h is the size for the duct opening measurement only

16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" The first number in a+ 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