During a fire the ceiling cavity in which loudspeakers areinstalled can allow flames to spread throughout abuilding. To prevent fire entering the cavity via theloudspeaker the ceiling loudspeaker can be fitted with asteel fire dome (LBC 3081/02). This optional fire dome isclicked into the mounting-ring via three leaf springsbefore the loudspeaker is inserted. For extra conveniencea safety cord from the fire dome allows the installer totemporarily hang the loudspeaker unit during installation.This cord also provides reassurance after installation. Thefire-dome has knockout holes for two grommets(supplied) and two cable glands (PG 13).This fire dome can only be used with the LBC 3086/41Ceiling Loudspeaker.Dimensions (dia. x max. depth) 157 x 70 mm (6.2 x 2.8 in)Weight 360 g (0.8 lb)Color Flame red (RAL 3000)Certified B15 Acc. to DIN 4102