Type of Duct System: Flexible
Diameter: 4 in
Length: 10 ft
Insulation: Insulated
R-Value: R-4.2
Maximum Flame Spread: 25
Maximum Smoke Development: 50
Material: Thick fiberglass insulation blanket. Heavy-duty silver metalized outer jacket
Application: Suitable for use with heating, ventilation, and air conditioning systems. Specifically designed to insulate rigid or semi-rigid round ducts
Color/Finish: Silver