"Definition: ODP

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. "
http://www.oddparts.com/acsi/defines/odp.htm

"Métrique CEI - LEESON Canada
www.leeson.ca/html/techref/MetricIEC_f.html
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Pour fin de comparaison un moteur IP22 serait équivalent à un moteur ouvert (ODP), tandis que IP54 serait équivalent au moteur totalement fermé et ventilé ...

"Métrique CEI - LEESON Canada
http://www.leeson.ca/html/techref/MetricIEC_f.html
Pour fin de comparaison un moteur IP22 serait équivalent à un moteur ouvert (ODP), tandis que IP54 serait équivalent au moteur totalement fermé et ventilé ..."

Open drip proof (ODP)
"Open enclosures permit cooling air to flow through the motor. The rotor has fan blades that help move the air through the motor. One type of open enclosure is the ODP enclosure. In an ODP enclosure, the vent openings prevent liquids and solids that fall from above at angles up to 15° from vertical from entering the interior of the motor and damaging the operating components. When the motor is not in the horizontal position, such as when it is mounted on a wall, a special cover might be necessary to protect it. An ODP enclosure can be specified when the environment is free from contaminants and where wind-driven rain is not a consideration."
Par opposition à "Totally enclosed nonventilated (TENV) " ou "Totally enclosed, fan cooled (TEFC)"