28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 Design – This airflow control

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

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

75"H – fits a 16" X 12" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 20" OR 20" x 24" duct opening (measured at the opening)

28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 Design – This airflow control+ 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