12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height

+ Product Details Outer dimensions: – fits a duct opening

Constructed from durable

Actual Filter Size – 15 3/4"w x 17 3/4" x 1"

Actual Front End Outer Dimensions Are 8" Diameter

12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 27. 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