28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 75"H – fits a 18"

75"H – fits a 18" X 10" duct opening

Design – This airflow control component are made to connect to a drop ceiling lay-in diffuser grille

actual front end outer dimensions are approximately 27

actual front end outer dimensions are approximately 26 5/8" width X 28 5/8" height

28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 75"H – fits a 18"+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 30" OR 30" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 29. 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