This ducting was 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 a heavy-duty dual aluminum foil that is fire/flame resistant. While the outer layer is made of dual PVC thermoplastic that protects the aluminum from cuts and tears, while stopping leakage. The ducting are held together by an internal steel-wire spiral that is flexible and easy-to-install in hard to reach places. The ducting can be shorted but cutting the tube, to fit various applications. Includes two stainless steel duct clamps.