Insulated Flexible Duct, Insulation Value R 4.2, UPC Number 30, Inside Dia. 4 In., Wall Thickness 1-1/4 In., Vapor Transmission 0.05, Material Polyester, Length 25 ft., Max. Air Flow 5000 fpm, Max. Pressure 6 In.WC, Max. Temp. 180?FLow Temp. Deg. -20?FFor Use With Heating and Cooling Systems, Features Air Tight Inner Core, Encapsulated Wire Helix, Smooth Inner Core, Thick Blanket of Fiberglass Insulation, Tough Reinforced Metallized Polyester Jacket, Light Weight Compact Carton
- Note: R-Values are in accordance with ADC Flexible Duct Performance and Installation Standards (2003) using ASTM C-518 at installed wall thickness on flat insulation only.
- Recommended operating press.: 3/4" WC neg., all dia.; 6" WC pos., all dia. except 4" WC pos. for 14" to 18" dia. Temp. range: uninsulated duct -20 to 180 F; insulated duct -20 to 140 F @ max. press. and -20 to 180 F @ 2" pos. WC max.
- Rated positive pressure: 10" WC per UL 181 Velocity: 5,000 fpm Standard lengths: 25 ft. Flame spread/smoke developed: < 25 / < 50 Rated for indoor use
- Feature double-ply vapor barrier with tridirectional reinforcements. All-purpose ducts are gray polyester. Premium ducts are metallized polyester.