For condition signaling, security alerts, equipment obstruction warnings, and emergency evacuation signaling. Suitable for use in both hazardous and non-hazardous areas. The Hazard•Gard® EXFASC Fire Alarm Strobe Light is a visual fire alarm signaling device for hazardous areas. The EXFASC strobes are UL 1971 Listed for indoor signaling applications for the hearing impaired in non-sleeping areas. They are also UL Listed for Type 3R, 4X installations. The EXFASC contains a supervisory diode for use in fire alarm applications.