34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set 4" X 10" Is The

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

Looks like new after years of use

For 6" Round Duct Opening - Spiral or Flex

+ Product Details Size – 8" x 28" or 28" x 8" is the size for the duct opening measurement only

34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set 4" X 10" Is The+ 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