Atlas Sound has developed the only speaker assemblies that are UL classified for fire-resistance in the United States and Canada. The C803AT87FRK 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). The C803AT87FRK assembly includes an 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.