28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 16"w X 25"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 9 3/4"w x 27 3/4" x 1"

The total outer size of this grille is the listed size plus plus 2 and 5/8"

+ How To Measure A Grille Before You Buy Overall Size:

28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 14" OR 14" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 13. 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