The Dryer Hose is made of Flame-retardant aluminum foil+PVC. Flame-retardant coating, Built-in steel wire for reinforcement and long lasting performance. Resistant to high temperature and corrosion, it can be bent and expanded at will, and it is convenient and flexible installation. The Steel Wire Helix to Preserve the Shape,Keep Your Ventilation System Free of Rips and Pin Holes.YIJU Air Ducting Flexible Enough for Your HVAC Systems,Arbitrarily Bent,No Rigid Elbow,Reducing the Ventilation Resistance and the Leak of Wind. Ducts are Conduits or Passages Used in Heating, Ventilation, and Air Conditioning (HVAC) to Deliver and Remove Air.Works with Fans and Carbon Filter, It Also Can be as Ac Exhaust Hose and Dryer Vent Hose.