Ventilation
For proper ventilation, leave a minimum clearance of 10 cm (3.9 in.) from the rear and both sides of the AP. And bind your
loose cables together or place them on a cable tray to avoid blocking the air inlets.
Temperature and Humidity
To ensure normal operation and service life of the device, maintain appropriate temperature and humidity levels in your
equipment room. See Table-1 . Improper room temperature and humidity can cause damages to the device.
High relative humidity may affect
insulation materials, resulting in poor insulation and even electrical leakage, and
sometimes may lead to change of mechanical properties of materials and corrosion of metal parts.
Low relative humidity may dry and shrink insulation sheets and cause static electricity that can damage the circuitry
inside the device.
High temperature greatly reduces reliability of the device and shortens its service life.
Table 2-1: Required Temperature and Humidity for the RG-AP220-E(C)
Temperature
Relative Humidity
Long-term Short-term Long-term Short-term
10ºC to 45ºC
-10ºC to 50ºC
40% to 65%
10% to 90%
The ambient temperature and humidity are measured at a point 1.5 meters (4.9 feet) above the ground and
0.4 meters (1.3 feet) before the device when there is no protective board in the front or back of the rack.
The “short-term” means at most 48 hours of continuous operation in less than 15 days each year.
Cleanness
Dust poses a serious threat to device operation. Dust that falls onto the surface of the device can be absorbed onto metal
contact points by static electricity, resulting in poor contact. Electrostatic absorption of dust occurs more easily when the
relative humidity is low, which may shorten the service life of the device and cause communication failures. Table 2-2
shows the maximum concentration and diameter of dust allowed in the equipment room.
Table 2-2 Maximum Concentration and Diameter of Dust Allowed
Maximum diameter (
μ
m)
0.5
1
3
5
Maximum concentration
(Particles/m
3
)
1.4 x 10
7 x 10
2.4 x 10
1.3 x 10
Besides, the contents of salts, acids and sulfides in the air are also strictly limited for the equipment room. These
substances can accelerate metal corrosion and the aging of some parts. Table 2-3 describes the limit of some hazardous
gases such as SO
2
, H
2
S, NO
2
and Cl
2
in the equipment room.
Table 2-3 Limits of Hazardous Gases