We offer a variety of air ducts to meet your requirements. Fire retardant material and steel wire helix features equip these air ducts for maximum durability. Our air ducts are for use with our ventilators for fume removal or to bring in fresh air to manholes, tanks, or other enclosures. Two single-ply PVC vinyl coated blue polyester fabric hose with a black external wearstrip reinforced with a spring steel wire helix. Lightweight duct for blower applications. We offer this tough weather resistant hose with dual directional flow and low friction loss for exceptional efficiency in moving air and fumes. Model Length can make as your requests