During a fire, the ceiling cavity in which loudspeakersare installed can allow flames to spread throughout abuilding. To prevent fire entering the cavity via theloudspeaker, the ceiling loudspeaker can be fitted witha steel fire dome (LBC 3081/02). This optional firedome is clicked into the mounting-ring via three leafsprings, before the loudspeaker is inserted. For extraconvenience, a safety cord from the fire dome allowsthe installer to temporarily hang the loudspeaker unitduring installation. This cord also providesreassurance after installation. The fire-dome hasknockout holes for two grommets (supplied) and twocable glands (PG 13).This fire dome can only be used with the LBC 3086/41Ceiling Loudspeaker.