FC104T72FRK is UL classified for fire-resistance in the United States and Canada. The FC104T72FRK 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 FC104T72FRK is pre-manufactured and assembles quickly on-site with no special tools or skills. The assembly includes an enclosure-fiber kit, UL listed speaker/transformer assembly, and choice of UL Listed baffle. Each enclosure-fiber kit includes pre-cut fiber panels, metal enclosure, rail set, and hardware. Atlas-Sound FR Series offers a wide variety of cost, performance, and aesthetic options. The 43 speaker/transformer combinations approved for use in FR assemblies are FR versions of the industry standard Atlas-Sound Strategy Series FA134, FA136, FA138 models and the C803A, C5A, C10A, and FC104 loudspeakers. The approved baffles are also FR versions of familiar Atlas-Sound models. To maintain UL Classification for fire-resistance, enclosure-fiber kits must be used with FR Series components.