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An ODP enclosure on a motor means "Open, Drip Proof".
ODP motors are relatively inexpensive motors used in normal applications.
The construction of an ODP motor consists of a sheet metal enclosure with vent stamped to allow good air flow. The vents are designed in such a way that water dripping on the motor will not normally flow into the motor. A fan is mounted on the motor's rear shaft to pull air through the motor to keep the motor cool.
The ODP motor is relatively inexpensive, but care should be taken not to use the motor in applications where the TEFC motor is required.