34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Round Duct Pipe padding: 18px

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+ Product Details Size - 25"w X 16"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 26" OR 26" x 20" duct opening (measured at the opening)

+ Product Spec Sheet Floor Register Spec Sheet

+ Product Details Size - 24"w X 6"h X 2"d (for duct opening measurement only)

34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Round Duct Pipe padding: 18px+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 29. 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