Optical Fiber Nonconductive Plenum (OFNP) and Optical Fiber Nonconductive Riser (OFNR) are two fire protection classes used for fiber optic patch cord. OFNP fiber patch cords offer the highest fire resistance and are suitable for use in plenum spaces such as air ducts and. This blog compares FS OFNR and LSZH fiber optic cables, highlighting their features and ideal applications to help you choose the suitable option. It is often used as a prefix to more specific flame-retardant ratings. As early as the mid-1980s, halogen (especially brominated) flame retardant polymer systems were. Industrial Use: Perfect for use in industrial settings where mechanical strength and fire resistance are critical. Emergency Systems: Ideal for. onal during fire. The unique design features extended Fire Resistant properties (XFR) which secure operation during fire test with bending and impact from hammer shock. In addition, also with water spray and. Our fiber optic patch cords are factory terminated, inspected and tested to meet industry standards. Standard patch cords are available in simple or duplex style, have matching connectors.