The professional ODH1000 is a 4/8/16 -zone, Class B conventional fire alarm control panel, meet the latest UL864&EN54 ... alarm controller, fire alarm control unitFeatures1) 4/8/16 Style B (Class B) Initiating Device Circuits (IDCs). - All zones accept two-wire ... requirements using fuseless technology.3) Two built-in, Style Y (Class B) Notification Appliance (Signal) Circuits (NACs). 4) NACs may be ...