28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size -

+ Product Details Size - 28"w X 6"h is the size for the duct opening measurement only

angle the louvers up for efficient cooling

actual front end outer dimensions are approximately 10 5/8" width X 16 5/8" height

[Outer Dimensions: 38

Traditional HVAC systems were designed for cold air

28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size -+ 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