This company’s #1599B is a clear, flexible duct-closure tape that is conformable and can be torn by hand. It is designed for heating and air-conditioning systems. It offers higher adhesion and tack than traditional cloth duct tape, and its long-life acrylic system offers superior performance in extreme environments. One of the tape’s key features is its transparent surface. Because it is clear, it can be used on any color of flexible duct, eliminating the need for contractors to carry the extra inventory of gray, black and silver tapes.