2-Ply Polyester Air Duct

Construction Materials
Duct liner is permanently bonded to a corrosion resistant spring
steel wire helix, also supporting a blanket of fiberglass insulation.
Vapor barrier is an outer jacket of fiberglass reinforced metalized
film laminate.

Codes / Standards
UL 181 / Class 1 Air Duct

Operating Pressure (inches water column)
Positive = 10 inches H²O (2.5 kPa) intermittent
Positive = 6 inches H²O (1.5 kPa) continuous
Negative = 2 inches H²O (0.5 kPa)

Operating Temperature Range
@ 6 inches H²O (1.5 kPa) Positive
Minimum = -20°F (-28°C)
Maximum = 140°F (60°C)

@ 2 inches H²O (0.5 kPa) Positive
Minimum = -20°F (-28°C)
Maximum = 180°F (82°C)

@ 1/2 inches H²O (0.12 kPa) Positive
Maximum = 250°F (121°C) intermittent

Velocity (feet per minute)
4,000 f.p.m. (20.3 m/sec)

R-Value
R-4.2, R-8.0

Surface Burning Characteristics
Maximum Flame Spread = 25
Maximum Smoke Development = 50

Vapor Barrier Permeance
0.04 perm (2.3 ng / s.m².Pa)

Available Diameters
3, 4, 5, 6, 7, 8, 9, 10, 12, 16, 18 inches

Available Lengths
6, 10, 25 feet