The Master Flow Insulated Flexible Duct R8 Silver Jacket is engineered for enhanced thermal efficiency, featuring R8 fiberglass insulation that offers 33% more insulation than standard R4.2 products for superior energy savings. Ideal for standard heating, air conditioning systems, and various venting applications, this versatile duct can be easily cut to the required length. Its durable construction, with a heavy-duty silver jacket and galvanized core wire, ensures long-lasting performance and protection against corrosion. ETL listed and compliant with UL181 standards, this duct meets stringent safety and quality requirements, making it a reliable choice for efficient and cost-effective HVAC systems.