OFNP designates optical fiber nonconductive plenum cable, an all-dielectric fiber optic cable rated for installation in plenum air-handling spaces, with strict fire performance.
OFNP designates optical fiber nonconductive plenum cable, combining the all-dielectric nonconductive optical classification with the highest fire-performance rating. Plenum-rated cable meets strict requirements for low flame spread and low smoke generation because it is installed in plenum spaces, the air-handling areas of a building where fire and smoke could spread rapidly through the ventilation system.
Because plenum spaces carry circulating air, cable installed there must limit its contribution to flame and smoke in a fire, which is why OFNP cable uses specially formulated materials. The combination of nonconductive construction and plenum fire performance suits it to the most demanding fiber installation locations.
In commercial and industrial facilities, optical fiber nonconductive plenum cable carries fiber communication through air-handling spaces where the highest fire performance is required. Selecting the correct class for both the nonconductive type and the location is part of meeting safety requirements and building a compliant fiber system.
Because plenum spaces share air with occupied areas, the strict flame and smoke limits behind the plenum rating are a safety matter, which is why OFNP uses specially formulated materials suited to the most demanding fiber installation locations.
At Windy City Wire, the focus on fiber optic cable for commercial communication includes plenum-rated classes like OFNP. Supplying cable carrying the appropriate fire ratings helps commercial facilities apply the right optical product for air-handling spaces and other demanding locations.
OFNP (Optical Fiber Nonconductive Plenum cable)
NEC (National Electrical Code), which defines plenum optical fiber cable requirements