Thermal endurance: temperature endurance range from 0 ~ 185°f. (-18℃ ~ 85℃) Easy installation: free pair of 4 inch metal clamps made from stainless steel. flexible length for exhaust fan blower / inline fan Ducting size: 4 inches (diameter) x 8 feet (length) when fully extended Wide applications: kitchens, bathrooms, greenhouses, grow rooms, grow tents, etc. 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