iPower 4 Inch 8 Feet Non-Insulated Flex Air Aluminum Ducting Dryer Vent Hose for HVAC Ventilation, 2 Clamps included Ducting Size: 4 inches (diameter) x 8 feet (length) when fully extended Thermal Endurance: Temperature endurance range from 0 ~ 185F.(-18 ~ 85) Wide Applications: Kitchens, Bathrooms, Greenhouses, Grow Rooms, Grow Tents, etc Easy Installation: Free pair of 4 inch metal clamps made from stainless steel. Flexible length for exhaust fan blower / inline fan Fire Proof Coating: Flexible ventilation ducting made from high-quality flame-retardant aluminum and built-in corrosion-resistant wire helix for reinforcement and lasting performance