34" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe + How To Measure A

+ How To Measure A Grille Measure the size of the vent opening

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Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

or commercial environments

34" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe + How To Measure A+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 24" Or 24" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 23. 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