Tait TB9300 Installation And Operation Manual

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Tait TB9300 Installation And Operation Manual Manual pdf 71 page image

TB9300 Installation and Operation Manual Installation 71© Tait Limited March 20165.1.5 Cabinet and Rack VentilationThe cooling airflow for the base station enters through the front panel andexits at the rear of the subrack. For optimum thermal performance, theheated air that has passed through a base station must not be allowed to re-enter the air intakes on the front panel. Any space at the front of the cabinetnot occupied by equipment should be covered by a blanking panel. Referto Figure 5.1 on page 72.To allow enough cooling airflow through a cabinet-mounted base station,we recommend the following:■ an area of at least 23in 2 (150cm2 ) of unrestricted ventilation slots orholes in front of the air intakes for the fans for each subrack; forexample, thirty 0.25x3.3in (6x85mm) slots will allow therecommended airflow■ a vent in the top of the cabinet with an area of approximately 23in 2(150cm 2) per subrack, or a similar area of ventilation per subrack at therear of the cabinet behind each subrack■ a 2U gap at the top of the cabinet.Notice The ventilation opening must be unrestricted. If the slots orholes are covered with a filter, mesh or grille, the open area must beincreased to allow the same airflow as an unrestricted opening.The maximum ambient temperature entering the cabinet must not exceed+140°F (+60°C).If you are installing multiple subracks in a cabinet, ensure that there will beenough cooling airflow through the cabinet after the equipment has beeninstalled. For example, the recommended maximum number of subracks ina 38U cabinet is five, as shown in Figure 5.1 on page 72.If the base station is installed in a rack or cabinet with other equipment withdifferent ventilation requirements, we recommend that the base station bepositioned below this equipment.Auxiliary ExtractorFans The base station does not require auxiliary extractor fans mounted in thetop of the cabinet. If your cabinet is already fitted with fans, the followingprocedures apply:■ if there are six or more 4.75in (12cm) fans, each capable of extracting94.2 ft 3 per minute (160m3 per hour), they must run continuously■ if there are fewer than six fans, you must remove them and ensure thevent in the top of the cabinet has an area of approximately 23in2(150cm 2) per subrack.If you have any other configuration, the performance of your system willdepend on how closely you comply with the base station airflowrequirements described above.