Exhaust fan:
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Sound to start presentation
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Exhaust fan
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Vibration noise, Faulty air conditioning
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Computer turning on, humming fan, off
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Sewing machine
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Off, Old tv on
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Electronic melody for SMS alerts
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IPhone notification sound
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Defrost process, Spaceship freezer
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Windows notification sound
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Air cut, Fan blade rotation
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Portable fan
★★★★★