🔍 Key Concepts

• Difference between open and totally enclosed motor enclosures • What visible air openings or vents look like on a motor housing • How a totally enclosed fan-cooled (TEFC) motor is typically constructed and cooled

💭 Think About

• Compare each motor and ask: Can outside air flow directly through the windings, or is everything sealed except for the shaft? • Look carefully at the ends and sides of the housings: which motors clearly show slots, holes, or exposed laminations that air could pass through? • Think about where a motor used in a damp or hazardous space would need extra protection from outside atmosphere.

✅ Before You Answer

• Identify which motors have obvious vent slots or open frames – these are NOT totally enclosed. • Look for a motor where cooling is done by external fins or an outside fan, not by air flowing through internal windings. • Confirm that the choice you select has its interior completely covered by solid end-bells and housing, with no direct openings into the windings.