28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in actual front end outer dimensions

actual front end outer dimensions are 27

with actual outer dimensions of 30

featuring a 6" round duct opening

+ Product Details Size - 14"w X 10"h X 2"d (for duct opening measurement only)

Equipped with a lever for easy airflow adjustment and dampening

28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 20" OR 20" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 19. 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