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Listed double re-entrant type loudspeakers. They comply with the requirements of UL Standard 1480, Fire Protective Signalling Speakers. • They are designed to be used in conjunction with compatible control equipment for high intelligibility reproduction of audible emergency and protective signals as well as voice messages. • Model AP-15TUC includes a supervisory capacitor and is suitable for installation in systems employing supervised circuitry (25V/70.7V). Maximum supervised circuit voltage