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Cyclone® Type NNI

This ducting features superior thermal qualities with factory installed insulation, and is capable of moving large volumes of pre-conditioned air. Its smooth liner offers less air friction loss than other types. It is excellent for mobile vehicles that have air conditioning units manufactured to order.

Technical & Overview

Inside Diameter (inches)
  • 5 to 30*
Operating Temp. Range
  • -65°F to +250°F
  • Up to 50 ft.
  • Olive Drab.
*larger diameters available upon request

Features & Benefits

  • Galvanized spring steel wire helix, fully enclosed
  • Three ply neoprene coated nylon fabric with liner ply bonded to interior.
  • Insulation blanket encased between material plies
  • Thermoplastic scuff strip
  • Nylon thread stitching

Standard Tolerances

Random (Duct Excluding Cuffs)
  • + 1/4”
  • – 1/8”
  • + 1/2″ per foot
  • – 1/8″ per foot
Cuff(s) Soft End(s)
  • + 1/4″
  • – 0″
Cuff Lengths
  • +1″
  • – 1/2″

Coatings & Finishes

The coatings offered by Thermoid can reduce the loss of air and gases through the duct wall, increase abrasion and chemical resistance, reduce ducting flexibility, as well as the inside diameter of the duct, and increase the weight and wall thickness of the duct.
Available Coatings
  • Neoprene (CR) (Black) – Neoprene is the most commonly used industrial duct coating. It resists ozone, sunlight oxidation, heat and flame. Neoprene performs well in contact with oils, water and some chemicals. It has good tensile strength and resilience.
Maximum Recommended Coatings
  • Neoprene – 4 Coats (For coating, specify duct type and number of dip coats).
The following end finishes are integrally manufactured into the ducting.
Soft End
  • That portion of the duct where the wire reinforcement is omitted, having the same number of plies as duct body, plus one additional ply of fabric over soft area. This type of end provides a smooth clamping area.
Reduced End (Special)
  • The hose end has an ID that is smaller than the duct body. A rubber insert usually forms this end.
Plain End
  • Hose with a plain end is simply cut at a given point, the end being the same as the duct body. The wire at the cut end is crimped back to prevent snagging. All standard items are furnished with plain ends.
Belled End (Special)
  • A belled end has a soft end with an ID larger than the duct body.