| Class Number | Definition | |
|---|---|---|
| General | ||
| G1.0 | YEAR-ROUND FILTERED AIR CONDITIONING WITH HUMIDITY CONTROL | |
| G1.1 | YEAR-ROUND AIR CONDITIONING (NON-FILTERED) WITH HUMIDITY CONTROL. | |
| G1.2 | AIR CONDITIONING (NON-YEAR ROUND) WITH NO HUMIDITY CONTROL. | |
| G1.3 | WITHOUT AIR CONDITIONING OR HUMIDITY CONTROL BUT WITH NORMAL HEATING AND VENTILATION. | |
| G2.0 | WITH NORMAL VENTILATION BUT UNCONTROLLED HEATING AND HUMIDITY | |
| G2.1 | YEAR-ROUND EXPOSURE TO HEAT, COLD HUMIDITY, MOISTURE, INDUSTRIAL POLLUTANTS AND FLUIDS. | |
| G3.0 | OUTDOOR ENVIRONMENT WITH MOISTURE, MARINE AND/OR WEATHERING CONDITIONS. | |
| Application Specific | ||
| A1.0 | AIRCRAFT ENVIRONMENT (UNCONTROLLED) | |
| A2.0 | AUTOMTOIVE (UNCONTROLLED) | |
| A3.0 | TEST SOCKETS | |
| A4.0 | BURN-IN SOCKETS | |
| A5.0 | SPACE APPLICATIONS | |
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