Hi Mike:
We do not stock Monoprice cables. They are another Brand not associated with our OSD brand. But all of our OSD Branded speaker cable are CL3/FT4 rated certified for all residential in-wall/in-ceiling installations and most commercial applications except running the wire in heating and cooling ducts (that would require Plenum rated). All of our jackets are thicker and are UV treated so they can be used as direct burial. Regarding the gauges of the speaker wire a general rule is 0 to 80 feet use 16 gauge, for 80 to 150 ft use 14 gauge wire and 150 feet and beyond 12 gauge.
Good luck
TL/3769