Subducting: Maximising the Infrastructure You Already Have
For many network operators and installers, the biggest challenge is expanding fibre capacity without the cost and disruption of installing new duct routes. In busy urban environments, commercial estates or existing business parks, excavations are often impractical, expensive or heavily restricted.
Subducting offers an efficient solution. By creating new microduct pathways inside existing ducts, you can expand capacity, add flexibility and prepare for future fibre upgrades without disturbing live services.
What Is Subducting?
Subducting involves installing smaller microducts inside an existing larger duct. These new inner pathways can then be used to blow or pull fibre at a later stage.
The benefit is simple. You can add new fibre routes without touching the infrastructure that is already in use.
Subducting provides:
- A new fibre pathway inside an existing duct
- A modular approach to future expansion
- A safe way to increase capacity without interrupting services
It is a practical method that offers long-term value for network growth.
Why Use Subducting?
Subducting is chosen for three main reasons: cost, flexibility and minimal disruption.
Reuses existing infrastructure
There is no need to excavate or route new ducts. You make better use of what is already in the ground.
Reduces installation costs
Avoiding civils work delivers significant savings, especially in dense or difficult-to-access locations.
Adds flexibility for future upgrades
New microducts can be used later for blowing additional fibres when demand increases.
Minimises disruption to live services
Existing fibres remain untouched, ensuring continuity of service for clients and end users.
Supports long-term expansion
Subducting provides a scalable approach. You install capacity now that can be used later without further groundworks.
Where Subducting Makes the Most Sense
Subducting is especially effective in situations where access and disruption need to be managed carefully.
Urban deployments
Cities and town centres with limited access and high civils costs.
Commercial and business park upgrades
Ideal when tenants are upgrading infrastructure or adding new services.
Networks needing modular, scalable growth
Perfect for phased rollouts where extra capacity may be needed later.
Clients who want to maximise ROI
Reusing existing ducts delivers strong financial and operational value.
The Right Tools for Effective Subduct Installation
Subducting relies on accurate installation and well-controlled pushing or blowing forces. This is where the right machinery makes a clear difference.
The Flowlight V3 Fibre Blowing Machine is well suited for subducting because it can be configured with the correct accessories to install multiple microducts cleanly and consistently.
With the subducting kit, the V3 can install:
- 7 x 7/3.5 mm microducts
- 4 x 14/10 mm microducts
This provides flexibility across a wide range of deployment scenarios and helps ensure the microducts are installed straight, secure and ready for future fibre blowing.
You can learn more about the V3 machine here.
Why Subducting Matters for Modern Networks
Demand for bandwidth continues to rise, and operators need ways to scale without excessive disruption or cost. Subducting is a practical tool for building resilient networks that can grow over time.
It allows installers and network owners to:
- Prepare for increased capacity
- Avoid unnecessary excavations
- Increase speed of deployment
- Improve return on existing infrastructure
- Carry out upgrades with minimal downtime
When paired with the right fibre blowing equipment, subducting becomes one of the most efficient ways to future-proof a network.
