The F314 14 25 HD Black Double Ply Black Poly R-4.2 from Mueller Streamline is designed for high durability and insulation efficiency. This product features a heavy-duty double ply construction, providing an R-4.2 thermal resistance rating, ideal for various HVAC applications. With a diameter of 14 inches, it ensures effective temperature management. The black poly finish offers additional protection against environmental factors, making it suitable for both indoor and outdoor use. This lightweight insulation is easy to install and meets industry standards for quality and performance, making it a reliable choice for energy conservation.