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  • 4" X 25', R8, 5000 Fpm, 2-ply Silver Reinforced Metalized Polyester Jacket, 2-ply Black Pigmented Polyester With Spring Steel Wire Helix Core, Fiberglass Insulation, Class 1, Raw End, Standard, Flexible Air Duct
Atco Rubber Products

4" X 25', R8, 5000 Fpm, 2-ply Silver Reinforced Metalized Polyester Jacket, 2-ply Black Pigmented Polyester With Spring Steel Wire Helix Core, Fiberglass Insulation, Class 1, Raw End, Standard, Flexible Air Duct

1786826 MFG #: 13102404
Atco Rubber Products 4" x 25' R8 Flex Duct 1786826
  • Diameter: 4"
  • Length: 25'
  • Insulation Type: R8
  • Specifications
  • Description
  • Documents
  • Type: Class 1, Raw End, Standard
  • Insulation Type: R8
  • Burning Character: Flame Spread Less than 25, Smoke Developed Less than 50
  • Air Velocity: 5000 FPM
  • Rated Positive Pressure: 6 Inch WG per ADC Test FD-72R1 at 180 Deg F
  • Rated Negative Pressure: 1 Inch WG
  • Jacket Material: 2-Ply Silver Reinforced Metalized Polyester
  • Core Material: 2-Ply Black Pigmented Polyester with Spring Steel Wire Helix
  • Length: 25 Foot
  • Width: 4 Inch
  • Temperature Rating: 0 to 200 Deg F
  • Applicable Standard: NFPA 90A/90B, MH11637, UMC, IMC, UL 181 Class 1, ADC
  • Additional Information: Insulating Material Fiberglass; Permeance 0.01 US Perms per ASTM E96A; Application Indoor
MHP-25 (25' length) flexible duct is constructed with a spring steel wire helix, encapsulated in a 2-ply, air-tight inner core. Fiberglass insulation choices of R4.2, R6 & R8 encompass the core and a unique metalized, reinforced vapor barrier surrounds the entire duct.