HDPE Sub Duct – Fire Retardant

Low Friction
Flame Retardant Icon

Radius high-performance low friction Low Smoke Zero Halogen (LSZH) sub-duct provides excellent cable protection and management for low smoke and fire risk areas inside buildings and tunnels.

Engineered for ease of installation and durability, low friction duct allows fast, safe
and efficient network construction, maintenance and upgrade.

Radius Fire Retardant sub-ducts are designed for cable blowing & pulling and are extruded from LSZH-V2 material and feature a high-performance low friction, solid co-extruded inner layer made from an inert polymeric compound.

Robust and flexible, Radius LSZH sub-ducts offer high performance in complex installations (eg. many bends & gradients).

Our sub-ducts are available with ribbed or smooth inner bore according to your preference and can be supplied pre-roped or pre-cabled.

Supplied in continuous lengths on single-way drums or multi-way drums to increase ease of installation and minimise cost.

In addition, we offer a comprehensive range of fittings and accessories including bends, connectors, spacers, seals and access chambers.

Features & Benefits

  • Suitable for installation into low smoke and fire risk areas
  • Designed for cable blowing & pulling
  • Permanent low friction inner coating as standard
  • Class-leading blowing performance
  • Low Smoke, Zero Emissions material
  • Up to 16bar blowing pressure
  • Smooth or ribbed inner wall
  • Pre-roping or pre-cabling option
  • Supplied on single way or multi-way drums up to 4way
  • Supplied on drums typically between 500m to 2000m length
  • Coils and lengths options
  • Can be customised to meet user requirements
Why Low Friction Matters?


OD/ID (mm)
20 / 16
25 / 20
32 / 26
40 / 33
50 / 41
63 / 50

Other OD/IDs are available, please contact us to discuss your requirements.


  • Inner wall: Smooth or Ribbed
  • Numbering
  • Customer-specific print
  • Muti-way drums up to 4-way
  • Pre-roping with 8KN rope
  • Pre-cabling with fibre optic or copper cable

Available in white and light grey as standard:

colours x 12
  • Made to BS EN 61386-24 : 2010


  • Made to BS EN 61386-24 : 2010