Tait TB9400 Installation And Operation Manual

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Tait TB9400 Installation And Operation Manual Manual pdf 65 page image

DRAFT 4TB9400 Installation and Operation Manual Installation 65© Tait Electronics Limited September 20115.1.5 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 66.To allow enough cooling airflow through a cabinet-mounted base station,we recommend the following:■ an area of at least 23 in2 (150 cm 2 ) of unrestricted ventilation slots or holesin front of the air intakes for the fans for each subrack; for example, thirty0.25 x 3.3 in (6 x 85 mm) slots will allow the recommended airflow■ a vent in the top of the cabinet with an area of approximately 23 in2(150 cm 2) per subrack, or a similar area of ventilation per subrack at therear of the cabinet behind each subrack■ a 2 U gap at the top of the cabinet.Note The ventilation opening must be unrestricted. If the slots or holesare 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 38 U cabinet is five, as shown in Figure 5.1 on page 66.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 the topof the cabinet. If your cabinet is already fitted with fans, the followingprocedures apply:■ if there are six or more 4.75 in (12 cm) fans, each capable of extracting94.2 ft3 per minute (160 m3 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 23 in 2(150 cm 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.