The primary enemies of motors are liquids, dust, and heat. Motors are designed with different enclosures (cases) to operate in different environments. A drip-proof motor has ventilation vents and will operate successfully even if water occasionally drips on it. In a splash-proof motor, the vents are protected from both drips and splashes. Drip-proof and splash-proof motors usually have an internal fan that draws air through the motor to help prevent overheating. A totally enclosed motor can be used in wet, dusty environments because it has no vents; thus the air has no access to its internal parts. All of the heat generated inside the motor must be conducted to the outside surface and dissipated into the air. Some totally enclosed motors have a fan mounted outside the case to increase the air flow (cooling) around the motor enclosure.
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