28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

actual front end outer dimensions are approximately 24 5/8" width X 26 5/8" height

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+ Product Details Size – 6" x 24" or 24" x 6" is the size for the duct opening measurement only

and sound level range of NC 25 to 35

28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Actual Filter Size – 13+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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