Plenum Innerduct is a flexible, non-metallic, corrugated raceway used for effective cable and fiber optic management within interior raceways. Plenum meets UL-(910) standards for the National Electrical Code, Article 770, and satisfies UL-2024 standards for low smoke and flame propagation. Plenum is offered in 1", 1 1/4", 1 1/2" and 2" with pre-installed pull tape for easy cable installation. The standard color is orange and is offered in a variety of other colors. Sequential marked footage is standard. Custom options, such as multiple colors per reel and Slit Duct, are also available. Call 866-678-5852 for custom lengths (min. length 100')!