| Requirement | Operational |
|---|---|
| Temperature (dry bulb) | Allowable: 15° to 32°C (59° to 90°F) |
| Moisture | Allowable: 20% to 80% (relative humidity non-condensing) |
| Maximum dew point | 17°C (62°F) |
| Maximum altitude | 3050 m (10,000 ft) |
| Gaseous contamination | Gaseous contamination: Copper reactivity rate less than 300 Å/month. Silver reactivity rate less than 200 Å/month. |
| Particulate contamination | Particulate contamination: ISO 14644-1 Class 8 (data center air continuously filtered by MERV 8 filters and air entering the data center filtered by MERV 11 or, preferably, MERV 13 filters) |
| Vibration limit | Depends on the type of component in the cabinet. The operational vibration limit for a typical node is 0.26G (rms) at 10-500 Hz. The operational vibration limit for a typical disk component is 0.28G (rms) at 5-500 Hz. |
| Static discharge limit | 4000 V direct discharge; 8000 V air discharge |
Measuring and Evaluating Environmental Elements
Recommended handheld digital meters that can measure temperature, relative humidity, dew point, altitude, and airflow velocity are Kestrel 4000, Omega HHF81, or similar thermometer.
Measurements must be taken at the front of the cabinet before and after installation, and also after the equipment is in production.
Measuring and Evaluating Air Flow
Measure air flow rates of conditioned air entering a computer room through openings that include vented floor tiles, grate tiles, floor tiles with unblocked openings, and cold air diffusers in an overhead cold air delivery system.
Measurements must be taken after completing the installation to verify pre-installation measurements.
Measuring and Evaluating Temperature and Humidity
After the system is in production, take temperature and humidity measurements for each cabinet to make sure environmental requirements are met.
Environmental Contaminants
For details of the clean room standard, refer to https://www.ashrae.org/.