4" Insulated Flex Duct R-4.2 Polyethylene
Exterior Vapor Barrier
Core
- Two tough plies of black polyester film
encapsulate a steel wire helix.
- Rated pressures per UL-181: 10 in. W.C.
positive, 1/2" W.C. negative.
- Rated max. air velocity: 4000 FPM
Thermal Characeristics
- R-4.2 certified by Underwriters Laboratories
Inc. and the Air Diffusion Council in accordance with ADC Flexible Duct
Performance and Installation Standards using ASTM C-518 at installed wall
thickness on flat insulation only.
Vapor Barrier
- A durable black polyethylene vapor barroer
provides improved protection against ultra violet light.
- High tensile multi-directional fiberglass
scrim is used under the vapor barrier to provide additional strength and tear
resistance.
- Perm rating of 0.1 perms when measured per
ASTM E96, Method A.
Surface Burning Characterisitics
- Flame Spread: Less than 25
- Smoke Developed: Less than 50
Operating Temperature Range
- -20 Degrees F to 140 Degrees F Continuous
- -20 Degrees F to 250 Degrees F Intermittent
Approvals
- UL-181
- NFPA 90A & 90B
- HUD
- City of Los Angeles
- California Bureau of Home Furnishings
- Most Federal, State, and Local Codes and
Standards
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