79) describes the characteristics, construction and test methods for microduct fibre units and microduct cables that are used with the blowing installation technique. The use of Air Blown Fiber Systems gives complete freedom from risk by pre-installing a ducting route and then blowing in the fiber element when required. See this FOA Guide section for Blowing and Jetting Cables. Air blown fiber (ABF) has long been a flexible alternative to traditional structured cabling, allowing organizations to maximize future network moves, adds and changes while minimizing disruption to their facility. Developed in 1982, air blown fiber ensures the appropriate fiber is installed at the.