For use in plenum spaces such as duct work and above a drop ceiling, this sleeving self-extinguishes and emits minimal amounts of smoke and gas during combustion. Made of ECTFE, it protects contents from corrosive chemicals and organic solvents as the sleeving exits the duct. It’s expandable, so it stretches to fit over items for easy installation, then tightens around its contents for a secure fit. The braided construction permits heat and moisture to dissipate.