28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 function () { const item

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+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

Equipped with a locking eight-tumbler key system

+ Product Details Size - 14"w X 14"h X 2"d (for duct opening measurement only)

Solid Base for Stability – Built with a solid base for reliable mounting and stability

28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 function () { const item+ 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