In the event of a fire, a hole in the ceiling of the speaker allows the flames to spread throughout the building. To prevent the flame from entering the hole through the loudspeaker, the ceiling loudspeaker can be fitted with a steel flameproof cover (LBC 3081/02). Before installing the speaker, this optional flameproof cover is plugged into the mounting ring by three plate springs. For extra convenience, the safety cord of the flameproof cover allows the installer to suspend the speaker temporarily during installation. In addition, after completion of installation, this safety cable can also provide additional security protection. The flameproof cover is provided with an opening for installing two gaskets (with attached) and two cable sealing plugs (PG 13). This fireproof cover can only be used in conjunction with LBC 3086/41 ceiling speakers. Annotate product photos, including LBC 3086/41 speaker installation/configuration LBC 3086/41 + LBC 3081/02 fireproof cover assembly dimensions (unit: Nano meter number [in]) attachment component 1 3081/02 LBC flameproof enclosure 1 safety line 2 rubber gasket specifications mechanical size (diameter x maximum thickness) of 157 x 70 mm (6.2 x 2.8 inches), weight of 360 grams (0.8 pounds) flame red color (RAL) 3000 B15 certification in accordance with DIN 4102 standard order information LBC flameproof enclosure components applicable to LBC 3086/41 3081/02 Metal fireproof cover for ceiling speaker, flame-red RAL 3000. Order number LBC3081/0