CLASS 0 Uninsulated Flexible Duct and Method Of Use

An uninsulated flexible duct comprising:

• a core made of a polymer material and including a helical wire as a part thereof, the polymer material core having inner and outer surfaces and including a first adhesive;
• a fire resistant barrier material surrounding the outer surface of the polymer material core, the fire resistant barrier material including a seam running longitudinally along the length of the uninsulated flexible duct, the longitudinal seam having an overlap zone that contains at least one second adhesive to maintain an integrity of the longitudinal seam,
• the uninsulated flexible duct being free of any vapor barrier;
• the uninsulated flexible duct being a vapor barrier-free uninsulated flexible duct that has a flame spread index and smoke developed index of zero (0) as defined in the UL 181 standard and having one or more of the following features:
• a) if the fire resistant barrier material is a woven material, the weave of the woven material is such that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0);
• b) using an effective amount of the polymer material in the core so that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0);
• c) including an effective amount of a fire retardant in the polymer material so that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0);
• d) wherein the polymer material core is a fire retardant containing-film so that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0);
• e) the first adhesive includes a fire retardant in an effective amount so that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0);
• and
• f) the second adhesive includes a fire retardant in an effective amount so that the uninsulated flexible duct meets the flame spread index and smoke developed index of zero (0).