The shielded wiring duct routes, separates, and shields sensitive wiring from noise emission • Up to 20dB noise reduction, 90% noise voltage reduction (up to 6 inches air space) • Lead-free PVC with metallic foil finish • UL recognized continuous-use temperature – 122°F (50°C) • Provided with mounting holes • Base and cover length is 6 feet • Use with Type C cover (purchased separately)