Thermaflex® PHD

Flexible Air Duct

Patent pending Thermaflex PHD flexible air duct is energy efficient, environmentally friendly and cost effective. Made with 100% recyclable inner core and vapor barrier, PHD is a great choice for LEED projects and applications where sustainability is key. The non-metallic construction of this versatile duct also makes it ideal for MRI and clean rooms.


Watch the Thermaflex PHD video .

PHD Specs

Diameter 4-12 inches ID
Pressure Rating (WG)
Positive 10 inches (4˝-12˝ ID)
Negative 1/2 inch (4˝-12˝ ID)
Velocity 5000 FPM
Temp. Range -20°F – 250°F cont.
R-Value R-8.0 = 2.25″, .74 lb./ft3 minimum density fiberglass blanket.