The PC-580RVU is designed to fill the need for a high-performance, cost effective ceiling speaker for use in Mass Notification Systems, Voice Evacuation, Emergency Paging, and everyday Paging and Background Music requirements. The PC-580RVU speaker meets UL 2572 (ULC S541, UL 1480 UUMW) (Fire Alarm Signaling) and UL 2043 (use in air handling spaces) standards when using the HY-BC580U Back Can.