34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille allow you to customize airflow

allow you to customize airflow direction with ease

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

12"w X 4"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 32"w X 28"h is the size for the duct opening measurement only

34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille allow you to customize airflow+ 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