2-Ply Polyester Air Duct
Designed for wherever UL 181 standards for Class 1 Air Duct is required.
The 2-ply polyester laminated inner core provides outstanding resistance and durability
The fiberglass reinforced metalized outer jacket is extremely strong and
will not unravel
Suitable for use with heating, ventilation and air conditioning systems
Technical Data
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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
