IMPA 370107 – AIR HORN ELECTRIC OPERATION, W/HEATER 132HZ F/75-200MTR – Required installation under the international regulations for preventing collisions at sea. The frequency of the horns shall be between 130 – 350 Hz for a vessel greater than 75 mtrs but less than 200 mtrs in length, and 70 – 200 Hz for a vessel 200 mtrs or more in length. Manually operated and electromagnetic types are available.
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