34" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return 6" width X 13

6" width X 13

+ Product Details Size - 14"w X 24"h is the size for the duct opening measurement only

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

Universal size

34" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return 6" width X 13+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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 Made from