28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 Actual Filter Size – 9

Actual Filter Size – 9 3/4"w x 17 3/4" x 1"

+ Product Details Size – 18" x 26" or 26" x 18" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening)

Its elegant look and fine finish and the natural warmth of oak wood

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28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 Actual Filter Size – 9+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 30" OR 30" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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