OFNP stands for Optical Fiber Nonconductive Plenum. OFNP cables have fire-resistanceand low smoke production characteristics. They can be installed in ducts,plenums and other spaces used for building airflow. This is the highest fire rating fiber cable and no other cable types can be used as substitutes.

OFNR stands for Optical Fiber Nonconductive Riser. OFNR cables are used in Riser areas which are building vertical shafts or runs from one floor to another floor. OFNR cables can not be installed in plenum areas since they do not have the required fire and smoking rating as Plenum rated cables. OFNP plenum cables can be used as substitutes for OFNR cables.