C803AT87FRK Fire Rated 8" Coaxial Loudspeakers, 16 watt (UL Listed) 70.7V-8W xfmr by Atlas Sound. They made and developed a the only speaker assemblies that are UL classified for fire-resistance in the United States and Canada. It is safe to use and has passed a fire-rating up to three hours (rating varies by ceiling construction) and has been tested in accordance with the UL standard Fire Test of Building Construction and Materials, ANSI/UL263 (ASTM E119, NFPA 251).
Its inclusions are enclosure-fiber kit, UL listed speaker/transformer assembly, and UL Listed baffle.
Each enclosure-fiber kit includes pre-cut fiber panels, metal enclosure, rail set and hardware. The speaker/transformer combinations approved for use in FR assemblies are FR versions of the industry standard Atlas Sound Strategy Series C803AT87FRK loudspeaker.