Communications Systems | LBC 3080/01 Fire DomeDuring a fire, the ceiling cavity can allow fire or smoke to spread throughout a building. To inhibit fire entering the cavity via the ceiling loudspeaker, it can be fitted with an LBC 3080/01 steel fire dome. This is mounted on the loudspeaker assembly using four self-tapping screws supplied with the fire dome. The fire-dome has knockout holes for two grommets (supplied) and two cable glands (PG 13). This fire dome can only be used with the ceiling speakers: LBC 3087/41, LBC 3090/01, LBC 3090/31, LHM 0606/00 and LHM 0606/10.