The Mueller Streamline FB214 16 25 features a robust silver double ply black poly construction with an R-value of 4.2, ensuring excellent thermal insulation. This product is engineered for HVAC applications, providing superior moisture resistance and durability. Its dimensions are optimized for easy installation in various settings, making it a versatile choice for both residential and commercial projects. The black polyethylene finish not only enhances its aesthetic appeal but also contributes to its longevity. This insulation solution meets industry standards, ensuring safety and efficiency in energy consumption.