Specification

KM Insulated Flexible Duct
WARRANTY
The first five years of installation in the case of any warranty issue or product failure,Thermaflex will cover all duct cost, material cost and any reasonable labor cost,
provided the Flexvent
®
product was properly installed in accordance with our written installation. For the second five years of installation, for a maximum of ten and in
the event of any Flexvent product failure or warranty issue,Thermaflex will make replacement of the defective duct only and no other cost will be reimbursed.
Worldwide Sales Headquarters & Customer Service Department
381 Carwellyn Rd. • Abbeville, SC 29620
In the US, call 1-800-459-4822 • In Canada, call 1-800-263-3539 • thermaflex.net
Applications and Engineering Data
CONSTRUCTION AND MATERIALS
Strong polyester film laminated and encapsulating a heavy, corrosion resistant steel wire helix, forms the inner core and supports a
thick blanket of fiberglass insulation.The outer vapor barrier is a bi-directional reinforced metallized vapor barrier that will not unravel.
The smooth airtight innercore of polyester is designed for low to medium pressure systems.
NOTE: For detailed information concerning air friction loss and acoustical
data, refer to separate technical bulletins published byThermaflex.Tests
performed according to Air Diffusion Council Air duct Test Code FD72R1.
OPERATINGTEMPERATURE RANGE (°F)
MINIMUM
MAXIMUM
-20
250
VELOCITY (FEET PER MINUTE)
5000
R-VALUE
4.2, 6.0, 8.0
SURFACE BURNING CHARACTERISTICS
MAX. FLAME SPREAD
MAX. SMOKE DEVELOPED
25
50
VAPOR TRANSMISSION RATING
(U.S. PERM)
0.1
ALSO CLASSIFIED BY Underwriters Laboratories, Inc.
®
IN ACCORDANCE WITH ADC FLEXIBLE DUCT
PERFORMANCE AND INSTALLATION STANDARDS
(1991) USING ASTM C-518 (1991) AT INSTALLED WALL
THICKNESS ON FLAT INSULATION ONLY
R-4.2/6.0/8.0
NOMINAL INSIDE DIAMETER
(INCHES)
4 5 6 7 8 9 10 12 14 16 18 20
LENGTH (FEET)
25 25 25 25 25 25 25 25 25 25 25 25
INSIDE BEND RADIUS (INCHES)
4 5 6 7 8 9 10 12 14 16 18 20
OPERATING PRESSURE
(INCHES WATER COLUMN)
Positive = 10 inches (4-16 in. ID) 6 inches (18-20 in. ID)
Negative = .5 inch (4-20 in. ID)
12908_KM Sellsheet:Layout 1 12/14/11 8:04 AM Page 2