28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in + Product Details Size -

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

Universal Fit – Measures 6-1/4" wide x 4-3/4" high x 3" deep

Equipped with a lever for easy airflow adjustment and dampening

helping to maintain consistent temperature settings

actual front end outer dimensions are 27

28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in + Product Details Size -+ 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