28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood [Outer Dimensions: 10

[Outer Dimensions: 10

'block' : 'none'

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

also referred to as T-Bar or Lay-in system

+ Product Description Maximize your home’s airflow with this premium Air Supply Grille air supply grille

28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood [Outer Dimensions: 10+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 12" OR 12" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 11. 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