HP LH4r HP Netserver LH 4 User Guide - Page 50
Ventilating Fans
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Chapter 7 Installing Additional Power Supplies Ventilating Fans HP NetServer fans are placed to ventilate and cool internal components. The LH 4 and LH 4r use a redundant fan assembly with two fans that mount directly in front of the fans cooling the power supplies. In general, if any one fan fails, the NetServer will continue to operate, but if two fans fail, thermal shutdown will occur. CAUTION The NetServer must have its covers in place for proper cooling. If you open the NetServer while it is operating, do not run it for more than three minutes. Do not run the NetServer for more than two minutes without at least one working fan in the fan assembly mounted immediately behind the power supplies or in the exhaust fan assembly. Failure to observe these precautions may result in thermal damage to the NetServer. Servicers can hot-swap any fan except the processor fan. If this fan fails, or if the metal baffle is removed, thermal damage to the NetServer can occur. 44