28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe 40"w X 16"h Is The

40"w X 16"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are 25" Width X 13" Height

75"H – fits a 10" X 10" duct opening

+ Product Spec Sheet Lay-In 3 Coned Spec Sheet

28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Round Duct Pipe 40"w X 16"h Is The+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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 Made from