Plenum Cable
Plenum Cable : Cable that can meet the UL 910 (Steiner Tunnel) test by using fire retardant insulation that inhibits fire propagation and toxic fumes. These cables can be used in horizontal runs in open air ceiling returns and will be clearly indicated with a "P" suffix (such as CMP) as certified by UL, ETL or other third party testing firms. It is typically coated with Teflon