During 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 LBC3080/11 steel fire dome. This is mounted on the loudspeaker assembly using four selftapping screws supplied with the fire dome. The firedome has knockout holes for two grommets (supplied) and two cable glands (PG 13). This fire dome can only be used with the ceiling speakers: LBC3087/41, LBC3090/01, LBC3090/31, LHM0606/00, LHM0606/10 and LHM0626/00.