HOSE: The dryer vent hose is made by high-quality aluminum (High Temperature Resistant & Corrosion Resistant & Long Lasting); The Clamps are made by stainless steel (Rustproof & Corrosion Resistant & Heavy Duty). ADVANCED THREE LAYER : Under the PVC layer the dryer duct hose is built with 2 layers of aluminum foil. A layer of durable PET and steel wire helix to preserve the shape, keep your ventilation system free of rips and pin holes. DUCTING PARAMETERS : 20cm diameter, This dryer duct is 5M long when fully extended, and the ducting can bend freely. Thermal endurance ranges from -22 to 260 F (-30 to 107 C). EASY TO INSTALL : Flexible and simple to Install the dryer vent hose. The dryer duct comes with two clamps to fixed the air ducting.Simple, convenient and durable. WIDELY USED: The flexible dryer vent hose suits HVAC system. It will move and deliver air in Kitchens (cooking exhaust), Green Houses and Grow Rooms (Air Circulation, Intake, Exhaust and Light Fixture Cooling),