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