Plenum fiber optic cable, also called OFNP cable, is designed for use in plenum spaces within buildings. Plenum spaces include areas above drop ceilings and below raised floors used for air circulation and air conditioning. OFNP cable features a flame-retardant, low-smoke jacket that produces fewer harmful fumes and can self-extinguish in the event of a fire. This makes it safer to install in plenum spaces where air is circulated throughout a building. Plenum cable helps prevent the spread of fire between floors and can reduce network cabling costs by providing an easy way to run cable through open ceiling spaces.

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With the wide use of fiber optic cables, more and more users show their interest in plenum fiber optic
cable, which is also called OFNP cable. This cable provides high-speed, high security, high fire-resistance
rating, and low-smoke PVC or FEP compounds.
Plenum Space
Plenum space is an area used for return of air circulation or air conditioning systems. Most
building codes ( hospital, school, living , airport, and commercial building) mandate that only
plenum cables be used in plenum spaces and air ducts. Usually, the plenum spaces are the open
spaces above a drop ceiling and below the raised floor. In most buildings with heating ,ventilation
and air conditioning systems ( HVAC ), air ducts supply air from the external HVAC unit to the
inside of the building, but the return air goes through the open space above the drop ceiling

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instead, making it a plenum space. These spaces are essential for air circulation, but they pose a
major fire hazard because of the high rate of airflow.
What is Plenum Fiber Optic Cable?
Plenum fiber optic cable or optical fiber non-conductive plenum (OFNP) is the designation given
by the national fire protection association (NFPA) to interior fiber optic cables which contain no
electrically conductive component, and which are certified for use in plenum applications.
Furthermore,plenum cable consists of a flame-retardant, low-smoke jacket that emits a lower
amount of fumes and can self-extinguish. This jacket can be a fluorinated ethylene polymer (FEP),
polytetrafluoroethylene (PTFE), or low-smoke polyvinyl chloride (PVC).
Features and Benefits

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Plenum cable has fire resistance and low smoke production characteristics, provides high-speed,
high security, and helps prevent the spread of fire from floor to floor in a building. In addition,
using plenum cables can help to reduce network cabling costs by making it easier to run cable
safely through the open space above dropped ceilings. You save time and money in comparison
to attempting to tear into walls and run the cable through small crawl spaces.
Applications
Plenum cable is often used in a duct, conduit, plenum, and other spaces for building airflow,
gigabit ethernet, broadband systems, telecommunication, data center, and indoor/outdoor
applications.
Conclusion
Plenum cables use fluorocarbon jackets to provide the low smoke and flame characteristics. This is
the highest fire rating fiber cable and no other cable types can be used as substitutes. Sun
Telecom can provide plenum fiber optic cable for a global market.