This ducting is designed for various ventilation, circulation, and heating/cooling transfer applications. It features two-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.