Thermaflex® M-KC Flexible Duct (Test)

Flexible Air Duct

Our premier product, the M-KC Flexible Duct offers a comprehensive solution to your HVAC duct needs. Its unique woven fiberglass core is the most durable core available, and it promotes superior airflow. The rigid wire is permanently bonded to the core. Suitable for all pressure heating and cooling systems, it makes for easier and more affordable installation. The M-KC’s bi-directional reinforced metallized jacket resists tearing.

M-KC Specs

Diameter 4-16 inches ID
Pressure Rating (WG)
Positive 16 inches (4˝-10˝ ID)
10 inches (12˝-16˝ ID)
Negative 2 inches (4˝-16˝ ID)
Velocity 6000 FPM
Temp. Range -20°F – 250°F cont.
R-Value R-4.2, R-6.0
GREENGUARD Certifications GREENGUARD Indoor Air Quality Certified
GREENGUARD Children and Schools Certified


This product can expose you to chemicals including Antimony Trioxide, which is known to the State of California to cause cancer. For more information go to