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4300 Remote Broadband Access Concentrator Installation Instructions
Fan/Filter Replacement
Roof
Exhaust Air Filter
–48 VDC Fan
Front roof retaining bolts.
Access from the interior of the
cabinet.
Inlet Air Filters (4)
Figure K – Fan/Filter Replacement Diagram
The 4300 Remote BAC is equipped with one –48 VDC fan assembly located in the top of the cabinet behind the
rack-mounted equipment. The fan is retained by four 4 mm screws. It is accessible from inside of the cabinet.
There are four inlet air filters mounted to the inside of the front door. These filters can be replaced by opening the
door and simply sliding them vertically out of their retaining frame.
The air exhaust filter is located in the top of the cabinet above the –48 VDC fan. The exhaust filter is accessible by
removing the roof from the cabinet. To remove the roof, first open the front door and unscrew the two front roof
retaining bolts. These bolts are located near the front coners of the top of the cabinet (see above figure). They are
accessible from the interior of the cabinet. After removing the front retaining bolts the roof can be slid to the left and
lifted off of the cabinet. Remove the “L” tabs that retain the filter by unscrewing the ¼”-20 screws.
Filter Maintenance
It is recommended that you clean the filters every three to six months and replace them every two years. However,
more frequent maintenance may be required depending on the environment in which the cabinet is installed.
4300-A2-GZ40-00 July 2004 19