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Duct or conduit protects fibre optic cable from harsh environment. They are buried into the ground and then the cables are air-blown, pulled or pushed into the duct. Duct fibre optic cable must be rigid and flexible enough at the same time to be installed into duct system.

Duct air blown fibre optic cables

Duct fibre optic cables for air blown installation are part of the KDP portfolio for more than 10 years. Since then customers have successfully installed thousands kilometres of various cable constructions, with capacities from 2 fibres up to 432 fibres. The most frequently asked question, which cable producer have received, is which minimum distance the cable can be blown in and also which are recommended dimensions of micro ducts.

It is not possible to clearly determine the minimal blown distances of certain cable constructions. If the installer follows the recommended installation procedures, uses professional tools (e.g. compressor, air blown machine, calibration module) and the cable trace is suitable for blowing, smooth and without extreme bends, KDP can guarantee that you can achieve standard blown distances such as 1 000 m.

As an experienced manufacturer with many satisfied customers and multiple references, KDP do not exclude reaching the blown distance of 2 000m. However, these distances are rare. All success depends on cable quality, microduct quality, used equipment and the experience of installation team. Any reduced quality leads to decreased blowing efficiency.



Correct cable dimensions – ratio of cable outer diameters against microduct inner diameter (fill rate)

Inner layer of microtube – special layer with low coefficient of friction

Outer sheath material – The best friction have HDPE, LDPE and PA materials

Ovality – max 5%.

Stiffness, but also flexibility, due to possible bends on the route

Inner and outer diameter stability

Ovality and cable diameter stability


Cable weight