Fiber Jetting (Air-Blown Fiber)
Fiber jetting (air-blown fiber) pushes fiber cable through microduct using compressed air. Learn how ABF installation works and when it's used.
Fiber jetting, also called air-blown fiber (ABF) installation, is a method of installing fiber optic cable by using compressed air to push or float the cable through pre-installed microduct. Instead of pulling cable with tension, jetting machines propel it through the duct on a cushion of air, reducing friction and stress on the fiber.
How Fiber Jetting Works
Air-blown fiber installation starts with a network of empty microduct, small diameter tubing installed underground or attached aerially. A jetting machine feeds the fiber cable into the duct while injecting compressed air along its length. The air creates a cushion that lifts and carries the cable forward with minimal friction, while feed wheels provide additional forward push. Because the cable rides on air rather than being dragged by tension, crews can install continuous runs far longer than traditional pulling allows, often through gentle bends and multiple duct segments in a single session. This makes jetting well suited to long branch and distribution runs in fiber to the home networks.
Why Contractors Choose Air-Blown Fiber
Jetting reduces the physical stress placed on fiber cable during installation, since compressed air does most of the work instead of a winch pulling against friction. That lowers the risk of microbending or cable damage, especially over long distances. Air-blown fiber also supports network growth: once microduct is in place, contractors can blow in additional fiber later without new trenching or aerial work, which matters for phased builds and future capacity upgrades. It performs well in congested duct systems where traditional pulling would risk snagging on existing cables. For these reasons, jetting has become a standard method in FTTH last mile builds and municipal conduit networks nationwide.
Fiber Jetting vs. Traditional Cable Pulling
Traditional cable pulling drags fiber through conduit using a winch and pulling line, which builds up tension and friction over distance. That limits practical pull lengths and often requires pull boxes or splice points every few hundred to roughly a thousand feet on longer routes. Jetting removes most of that friction by floating the cable on compressed air, allowing continuous runs several times longer before a splice point is needed. Fewer splice points mean fewer potential failure points and lower long-term maintenance costs. Jetting also handles tighter duct configurations and shared conduit systems better, since the cable is not dragged against duct walls or neighboring cables along the way.
Fiber Jetting (Air-Blown Fiber), answered
What is Fiber Jetting (Air-Blown Fiber)?
Fiber jetting, also called air-blown fiber (ABF) installation, is a method of installing fiber optic cable by using compressed air to push or float the cable through pre-installed microduct. Instead of pulling cable with tension, jetting machines propel it through the duct on a cushion of air, reducing friction and stress on the fiber.
How far can fiber be jetted in a single run?
Distance depends on duct diameter, bend radius, cable weight, and air pressure, but jetting commonly achieves continuous runs of several thousand feet, well beyond what tension pulling can manage in one segment. Longer routes may still use intermediate air-assist points to extend the run further.
Is air-blown fiber the same thing as microduct?
No. Microduct is the small diameter tubing installed as the physical pathway, usually in bundles inside a larger duct or conduit. Air-blown fiber, or jetting, is the method used to install cable into that microduct once it is in the ground or on the pole line.
When do contractors choose jetting over pulling fiber cable?
Jetting is typically chosen for long continuous runs, congested duct systems with existing cables, and projects where future fiber additions are planned. Traditional pulling is still common for shorter runs or when microduct is not part of the design.