<b>Product description：</b><br> This ducting is designed for various ventilation, circulation, and heating/cooling transfer applications. It features four-layer protection, making it more durable and resistant to leaks than single-layer designs. The internal layer is made of heavy-duty dual aluminum foil that is fire/flame resistant. Its outer layer utilizes dual PVC thermoplastic that protects the aluminum from cuts and tears while stopping leakage. Each duct tube is held together by an internal steel-wire spiral that is flexible and easy to install in hard to reach places. The ducting can be shortened by cutting the tube to fit various applications. Includes two stainless steel duct clamps.<br><br> Flex Ducts are light-weight, fully insulated, easy to install, and high quality. Ducts like this are the key to maximizing the efficiency of HVAC units.<br><br> Flexible duct is quality duct and has become the most popular type of duct used in HVAC systems.<br> 4 inch duct hose is made of flame retardant dual aluminum foil and PVC thermoplastic. Suitable for working between -22 and 266℉.<br><br> Primarily used with duct fan systems in various air circulation and ventilation projects including hydroponic grow rooms and tents, bathrooms and attics, heating and cooling transportation, and other installations. It is also used to cool AV equipment rooms, closets, racks, and cabinets.<br><br> <b>Specifications:：</b><br> Material:<br> Double Aluminum Foil (high-quality, high-temperature & corrosion-resistant)<br> Black PVC Thermoplastic (light-weight, high-strength & low fluid resistance)<br> Color: Grey<br> Duct Opening Size: 4Inch/100mm<br> Tube Length: 10 feet/3m<br><br> Package Included:<br> 1 x Grey 4-inch Flexible Ducting<br> 2 x Stainless Steel Clamps<br>