CONFORMS TO EN 12941:1998 + A1:2003 + A2:2008. The PA710CEU blower is the heart of the PAPR. It draws contaminated air through the filter cartridge and pushes a continuous flow of clean air to the user. Every system is programmed and calibrated at the factory to provide a steady and measured flow of air, even as the filter cartridge becomes saturated with contaminants. The blower also includes an intelligent alarm system that alerts the user when the battery charge or air- flow level is low. The system uses audible, visual and vibratory notifications to effectively and clearly communicate alarm status, even in loud, harsh conditions