In a single family residence, the space of two floor joists is enclosed with galvanized sheets and is used as a return air duct. Can a low voltage conductor that is not rated for low smoke be routed alongthe face of these wood enclosed space? Why or Why not?

In a single family residence, the space of two floor joists is enclosed with galvanized sheets and is used as a return air duct. Can a low voltage conductor that is not rated for low smoke be routed alongthe face of these wood enclosed space? Why or Why not?