| Particle Size (Micron) | Pressure Dew Point (°F) | Oil Content (PPM) | |
| 1 | 0.1 | -94°F | 0.01 | |
| 2 | 1 | -40°F | 0.1 | |
| 3 | 5 | -4°F | 1 | |
| 4 | 15 | -38°F | 5 | |
| 5 | 40 | -45°F | 25 | |
| 6 | 60 | -50°F | 40 |
Example:
• 1 Micron Particulate
• 38° F Pressure Dew Point (moisture Content)
• 0.1 PPM Oil Concentration
The ISO Class for this air quality is “2-4-2”
When selecting a dryer, size for the worst case to insure proper equipment performance under all
conditions. The critical variables to consider when sizing air treatment equipment are:
• Flow Rate (Max)
• Inlet Air Pressure (Min)
• Inlet Air Temperature (Max)
• Ambient Air Temperature (Min and Max)
• Process Water Temperature (Min and Max)
• Elevation (Max)
• Location (Indoors vs. Outdoors)