MAP20071501015 Letts, John Staying in control / John Letts System wich integrate automatic fire detection with other building monitoring and control systems are becoming more widespread. John Letts describes some of the system configurations available and explains how these should be monitored to ensure reliability En: Fire prevention. - London. - nº 332, Mayo 2000 ; p. 34-36 1. Seguridad contra incendios . 2. Sistemas de detección de incendios . 3. Detectores de incendios . 4. Alarmas . I. Title. II. Título: Fire prevention.