27
1RU Air Gap
LPS36 Shelf
LPS36 Air Baffle
1RU Air Gap
Open space or any equipment that
does not expel/radiate heat vertically
Equipment that expels heat upwards
The following figure shows the recommended configuration when equipment below the LPS36 shelf permits flow
of hot air (exhaust) upward.
Figure 15 — Natural Convection Hot Air Flow Upwards, 19/23"" systems
6�4�2 Forced Air Cooling without Fan Tray (Ta = +65
°
C max)
For operations where ambient temperature reaches 65°C maximum, forced air cooling is required. The LPS36
module has some flexibility to operate in high ambient temperature without using the standard LPS fan tray by
utilizing the internal airflow inside the OSP cabinet.
To determine the external airflow required for a given load, the graph below should be followed.
0
10
20
30
40
50
60
70
80
90
100
110
0
20
40
60
80
100
120
140
160
180
200
220
LP
S3
6
Av
er
ag
e
O
ut
pu
t p
er
C
han
ne
l (
W
)
Minimum Airflow, LFM
(linear feet / minute)
LPS36 Load vs. Required Airflow
[Maximum Ambient Temperature = 65
°
C]
Figure 16 — Minimum Air Flow
