34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Outdoor Vent Covers this air vent diffuser is

this air vent diffuser is built to last

The total outer size of this grille is the listed size plus 1

scratch-resistant

+ Product Details Size – 34" x 34" is the size for the duct opening measurement only

High Quality – high quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Outdoor Vent Covers this air vent diffuser is+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 26" Or 26" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 25. 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