Which type of cable is suitable for running in air ducts and complies with building code?

Riser cable is designed specifically for vertical spaces in buildings, including air ducts, and complies with building codes that dictate safety standards for fire resistance and low smoke emissions. This type of cable is constructed with materials that limit the spread of flames and reduce smoke, making it a suitable choice for installation in vertical shafts between floors and within air handling spaces.

Building codes often require that cables run in these environments meet certain performance criteria to ensure safety and minimize fire hazards, which riser cable is specifically engineered to achieve. Other types of wire and cable, such as utility wire, speaker wire, and coaxial cable, may not meet these stringent requirements for fire resistance and are not suitable for use in air ducts or vertical spaces as per building regulations.