Protection cover made of steel sheet for DL 18/1 and DL  18/2 with two push-out holes for cables. Four mounted screws to attach  terminals and cable clamps. The enlarged volume betters the sound of the inserted speaker.
Unsuitable  for fire protection ceilings (F30). 
Technical Data:
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                                                                                                                                                               | Net weight | 0,590 kg | 
                                                                                                                                      | Mounting depth with speaker | 170 mm |