

The FB218 Insulated Flex Duct (part number 13102405H) is a high-quality 5" duct with an impressive R Value of 8.0, providing superior insulation. Ideal for heating, air conditioning, and ventilation, this duct features a durable silver jacket reinforced with fiberglass scrim and a double-ply black polyester core. Each 25-foot length is UL-listed and GREENGUARD listed for microbial resistance. The FB218 is compatible with various HVAC systems and can be ordered in other sizes by special request.