18/4 Type CMP/CL3P, Shielded

Plenum cable (CMP) is specialized electrical or data cabling designed for safety in air-handling ("plenum") spaces, such as drop ceilings or raised floors, where HVAC systems circulate air. These cables use fire-retardant jackets—typically FEP or low-smoke PVC—that resist fire, produce minimal toxic smoke, and prevent fire spread.