34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size -

+ Product Details Size - 10"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 26"h is the size for the duct opening measurement only

12"w X 3"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size – 12" x 14" or 14" x 12" is the size for the duct opening measurement only

+ Product Spec Sheet Corner Baseboard Grille Spec Sheet

34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 6" Or 6" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 5. 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