Woot offers iPower Flexible 4 Inch 8 Feet Aluminum Ducting Non-Insulated Dryer Vent Hose for HVAC Heating Cooling Ventilation and Exhaust, 2 Clamps Included, Silver for $4.57 (orig. $9.61). Free shipping for Prime Members.

Product Description:
iPower Flexible 4 Inch 8 Feet Aluminum Ducting Non-Insulated Dryer Vent Hose for HVAC Heating Cooling Ventilation and Exhaust, 2 Clamps Included, Silver

• Wide applications: Kitchens, bathrooms, greenhouses, grow rooms, grow tents, etc.
• Ducting size: 4 inches (diameter) x 8 feet (length) when fully extended
• Thermal endurance: Temperature endurance range from 0 - 185°F. (-18℃ - 85℃)
• Easy installation: 1 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