2• Identify the hot aisle and cold aisle at the installation site, and make sure ambient air flows into theswitch from the cold aisle and exhausts to the hot aisle.• Identify the airflow designs of neighboring devices, and prevent hot air flowing out of theneighboring device from entering the device.• The rack is sturdy enough to support the switch and its accessories.• The rack or workbench is reliably grounded.To ensure correct operation and long service life of your switch, install it in an environment that meets therequirements described in the following subsections.Temperature/humidityMaintain temperature and humidity in the equipment room as described in "Appendix A Chassis viewsand technical specifications."• Lasting high relative humidity can cause poor insulation, electricity leakage, mechanical propertychange of materials, and metal corrosion.• Lasting low relative humidity can cause washer contraction and ESD and cause problems includingloose mounting screws and circuit failure.• High temperature can accelerate the aging of insulation materials and significantly lower thereliability and lifespan of the switch.For the temperature and humidity requirements of different switch models, see "Technical specifications."CleanlinessDust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metalcomponents and contact points, especially when indoor relative humidity is low. In the worst case,electrostatic adsorption can cause communication failure.Table 1 Dust concentration limit in the equipment roomSubstance Concentration limit (particles/m³)Dust ≤ 3 x 104 (no visible dust on the tabletop over three days)NOTE:Dust diameter ≥ 5 μmThe equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion andpremature aging of components, as shown in Table 2.Table 2 Harmful gas limits in the equipment roomGas Maximum concentration (mg/m3 )SO2 0.2H2 S 0.006NH3 0.05Cl2 0.01
