18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar "Opposing" back blades

"Opposing" back blades

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

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Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 8" duct openings

18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar "Opposing" back blades+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 15. 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