NORA Lighting NFBIC-4LMRATA 4" LED Dedicated IC Air-Tight Fire Rated HousingNORA Lighting NFBIC 4LMRATA NFBIC 4LMRATA 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 gases into ceiling plenums. The cULus listed housing is rated for a minimum of 2 hours protection. The noncombustible fiber fill also acts as sound deadening material eliminating the transfer of sound between