30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in making it ideal for preventing

making it ideal for preventing tampering or unauthorized adjustments

and keep the cold air out during the Winter Months

A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks

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also called T-Bar systems

30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in making it ideal for preventing+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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 Made from