20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Versatile Compatibility: Our ceiling grills

Versatile Compatibility: Our ceiling grills aren't limited to just T bar drop ceilings

+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

Constructed from durable

actual front end outer dimensions are approximately 30 5/8" width X 18 5/8" height

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Versatile Compatibility: Our ceiling grills+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 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