Cisco CATALYST 6509E 9 SLOT 15U CHASSIS NO POWER SUPPLY NO FAN TRAY Specification Guide

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Catalyst 6500 Series Switches Installation Guide
OL-5781-04
Chapter 4      Removal and Replacement Procedures
  Installing the Air Filter Assembly on a Catalyst 6509-NEB-A Switch (Optional)
Figure 4-59 Removing the Inner Filter Retainer
Step 4
Place the foam filter over the filter retainer. (See 
Step 5
Slide the retainer and filter into the cage assembly.
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Filter cage assembly
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Filter retainer
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Thumb loops
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Tabs
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