Nora Lighting NFBIC-6LMRATA/4W 6 Inch LED Dedicated IC Air-Tight Fire Rated HousingNora Lighting NFBIC 6LMRATA 4W NFBIC 6LMRATA 4W Product Description Specification grade fire rated new construction housing. The double wall fixture incorporates a non combustible fiber insulation to prevent passage of flames, toxic gases, ignitable gasses into ceiling plenums. The UL Classified housing is rated for a minimum of 2 hours protection. The noncombustible fiber fill also acts as sound deading material eliminating the transfer of sound