User's Manual

76 Installation TB8100 Installation and Operation Manual
© Tait Electronics Limited March 2005
To allow enough cooling airflow through a cabinet-mounted BSS, we
recommend the following:
■ an area of at least 150cm
2
(23in
2
) of unrestricted ventilation slots or holes
in front of the air intakes for the fans for each subrack; for example,
thirty 6x85mm (0.25x3.3in) slots will allow the recommended airflow
■ a vent in the top of the cabinet with an area of approximately 150cm
2
(23in
2
) per subrack, or a similar area of ventilation per subrack at the rear
of the cabinet behind each subrack
■ a 2U gap at the top of the cabinet.
Note The ventilation opening must be unrestricted. If the slots or holes
are covered with a filter, mesh or grille, the open area must be
increased to allow the same airflow as an unrestricted opening.
The maximum ambient temperature entering the cabinet must not exceed
+60°C (+140°F).
If the TB8100 BSS is installed in a rack or cabinet with other equipment
with different ventilation requirements, we recommend that the TB8100 be
positioned below this equipment.
Auxiliary Extractor
Fans
The TB8100 BSS does not require auxiliary extractor fans mounted in the
top of the cabinet. If your cabinet is already fitted with fans, the following
procedures apply:
■ if there are six or more 120mm (4.75in) fans, each capable of extracting
160m
3
per hour (94.2CFM), they must run continuously
■ if there are fewer than six fans, you must remove them and ensure the
vent in the top of the cabinet has an area of approximately 150cm
2
(23in
2
) per subrack.
If you have any other configuration, the performance of your system will
depend on how closely you comply with the TB8100 BSS airflow
requirements described above.