During a gas turbine normal running condition, a hood provides:
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prevention of turbine high dB noise to outside areas
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keeps the gas turbine clean from external dust
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provides a draft for the gas leak to the exhaust through the hood fan
During a gas turbine shutdown condition a hood provides:
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cooling the turbine body by way of the hood fan
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During a fire shutdown, it facilitates to put out the fire by confining the fire extinguishers on the gas turbine.