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Monoprice Plenum Speaker Wire is cable that is laid in the plenum spaces of buildings where air is circulated. Plenum cable has a fire-retardant plastic jacket designed to meet rigorous fire safety test standards. Beneficial for installers and contractors, Monoprice Plenum Speaker Wire is approved by Underwriters Laboratories. The cable is available in various gauges and lengths, all maintaining the high performance that Monoprice speaker cable is known for. Backed up by Monoprice's Lifetime Warranty, Monoprice's Plenum Speaker Wire series is the ultimate speaker wire for commercial and residential installations.