28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 + Product Details Size -

+ Product Details Size - 26"w X 12"h is the size for the duct opening measurement only

Versatility and Durability: The red oak wood not only adds a touch of warmth and softness to your room but can also be sanded and refinished according to your specific application needs

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

heat pump and centralized air ducted units

28" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w14h14 + Product Details Size -+ 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