Plenum Duct, Halogen Free Riser Duct, Riser Duct, and General
Purpose Duct are UL listed nonmetallic flexible raceways.
Fire-Flex Plenum Duct is for installation in ducts, plenums,
risers or other environmental air spaces. Fire-Flex Halogen
Free (HF) Riser Duct releases zero halogens upon combustion.
Fire-Flex Riser Duct is for installation in vertical runs
or shafts, and capable of preventing the spread of fire between
floors. Fire-Flex General Purpose (GP) Duct is pliable, nonmetallic
fire-resistant raceways for installation in general-purpose