Product details:

Top-quality, Thermal M-KC HVAC ducts are ideal for air venting and drying applications. These high-pressure spiral ducts can be for any low to high pressure heating and cooling systems. Ducts feature a strong woven fiberglass fabric core that is bonded to a steel wire coil to support the thick, air sealing insulation. These Ducts are self-extinguishing as well as mold and mildew resistant. Core will not unravel when cut. Temperature range is from -20F to 250F. Ducts measure 4-20" in diameter. Greenguard certified.