30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height

When it's time to upgrade your HVAC Vents in your house

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

+ Product Details Size - 16"w X 12"h is the size for the duct opening measurement only

Great emphasis has been invested in the design of this product to prevent it from kinking in sharp bends & turns and to hold steady and at full diameter in all applications

30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 34" OR 34" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 33. 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