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The D296 Projected Beam Smoke Detector is used in clear open structures such as arenas, atriums, auditoriums, ballrooms, churches, factories, museums, and warehouses. Each D296 detector consists of a transmitter, a receiver, and a remote annunciation plate. Because the transmitter and receiver typically mount on the ceiling or high on walls or columns, they provide an effective and unobtrusive means of supervising public areas for fire protection. The D306 Remote Indicator Plate, included with the D296, provides a convenient means of verifying detector status. Install it anywhere within 100 ft (30 m) of the beam receiver. The D306 has LEDs to indicate normal, trouble, and alarm conditions, and test points to monitor the detector circuit.