24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 const content = item

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Simplified Installation: Our Butterfly Damper ensures easy setup

These are specially sized to fit into all drop ceilings

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

and Diffusers

24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 const content = item+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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