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Fire detectors are essential components of a fire safety system because they provide early warning of fire by sensing smoke, heat, flame, or combustion products. Early detection allows occupants to evacuate safely and enables firefighting measures to begin before the fire becomes uncontrollable. Different types of detectors operate on different principles and are selected according to the nature of the building, occupancy, environmental conditions, and expected type of fire. Smoke detectors are among the most widely used fire detectors. They detect smoke particles produced during combustion. The two major types are ionization _______ _________ __________ _________ ___ __________ ____.
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