Blower unit with electronic monitoring of the device functions. The device automatically detects the type of breathing connection ty pe used (half/full face mask or hood/helmet/protective visor) and adjusts the volume flow range accordingly. In addition, manual reg ulation of the volume flow in three stages is possible. An automatic filter identification recognizes the filter used and indicates the saturation of the particle filter. System approved according to DIN EN 12941:2009 (in conjunction with Dräger X-plore 8000 hoods, helmets and visors) and DIN EN 12942: 2009 (in conjunction with Dräger X-plore half and full face masks and Dräger FPS full face masks). The device has the protection cla ss IP65 (6 dust proof, 5 jet water from all directions). Further approved according to ATEX: II 2G Ex ib IIB T4 Gb, II 2D Ex ib IIIB T135°C Db and IECEx: Ex ib IIB T4 Gb, Ex ib IIIB T135°C Db.