Thermaflex® M-KE Flexible Duct

Acoustical Flexible Air Duct

The M-KE Acoustical Duct offers exceptional sound control. Its acoustically rated chlorinated polyethylene (CPE) core allows sound energy transmission through the core and insulation, and into the plenum space. A highly efficient, self-extinguishing duct, the M-KE is suitable for use in all pressure heating and cooling systems.

M-KE Specs

Diameter 4-20 inches ID
Pressure Rating (WG)
Positive 10 inches (4˝-12˝ ID)
6 inches (14˝-16˝ ID)
4 inches (18˝- 20˝ ID)
Negative 1 inch (4˝-12˝ ID)
1/2 inch (14˝-20˝ ID)
Velocity 5000 FPM
Temp. Range -20°F – 200°F cont.
-20°F – 250°F intermittent
R-Value R-4.2, R-6.0, R-8.0
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