Waterproof and dustproof comply with EN 60529 IP33 standard **** * salt spray comply with IEC 68-2-11 Ka standard * only used in combination with LC1 - MFD. ** only combined with LC1‑MFD or LC1 - ‑CMR (including LC1 - ‑CBB). **** and **** only lc1-wc06e8 and lc1-cmr (including lc1-cbb). Note UL 1480 needs to be installed with LC1‑MFD or LC1 - ‑CSMB or LC1 - ‑CMR (including LC1 - CCB). LC1 UM06E8 and LC1‑UM12E8 are certified by UL 1480f for fire alarm and/or emergency communication systems. Regional certification European CPD Poland CNBOP USA UL 220mm (8.67in) 23mm (0.9in) 112mm (4.40in) 135mm (5.31in) lc1-um24e size LC1 modular ceiling speaker series is very easy to install. The speaker includes a frame with a speaker driver and a metal mask or an ABS mask, and a built-in light guide tube, matching transformer and ceramic screw terminal junction box. Optional pilot sound indicator board and circuit/speaker monitor board can be installed on the loudspeaker. The power jumper on the 70 V/100 V matching transformer allows the user to select full power rate, 1/2 power, 1/4 power and 1/8 power. Due to the modular concept of this system, users not only order LC1‑xMxxE ceiling speakers, but also order optional embedded ceiling mounting accessories, as described below. The speaker can be embedded into the ceiling using the LC1 MMSB U metal mount or LC1 CMR ABS ceiling mount ring (with optional LC1‑CBB bottom box). To take full advantage of the modular structure, all components are individually packaged in their installation order. Lc1-mmsb mounting frame this metal mounting frame is equipped with two ceiling clamps which can be fixed into the ceiling opening with finger screws. In addition, the frame is fitted with two 4-mm mounting holes to be fitted with two screws into a thin (metal) ceiling. It also comes with two spring clips that hold the v-shaped speaker spring in place. This mounting frame can also be fitted with optional safety wire rope. Lc1-mmsb metal mount lc1-cmr mounting ring LC1-CMR is an alternative to ceiling mount. The ABS mounting ring is fitted with two screws to hold the mounting ring to the ceiling. There are also two spring clips in the ring to hold the v-type speaker spring.