Flexible Duct (1M)


Flexmaster’s Type 1M is manufactured to meet the highest quality standards in strength, permeability and fire resistance required in a flexible air duct. This insulated ETL Class 1 Air Duct is fabricated with an acoustically transparent PE inner film which allows mid-range sound energy to penetrate the duct wall.


  • Liner: A PE (Polyethylene) inner film. Mechanically Locked without adhesives.
  • Helix: Corrosive resistant galvanized steel, formed and mechanically locked to fabric.
  • Vapor Barrier: Fire retardant reinforced aluminum material. Excellent strength at low temperatures. Will not age harden.
  • Insulation: Fiberglass insulation blanket, factory wrapped.

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