All installed fan modules must blow air in the same direction and must match the
airow direction of the installed power supplies.
• If the fan module has a red tab, the airow is front-to-back. Use a fan module labeled
Air Out.
• If the fan module has a blue tab, the airow is back-to-front. Use a fan module
labeled Air In.
Note
The operating-system software cannot display the airow direction.
Before you begin, have the replacement fan module on hand so that you can complete
the replacement promptly. The switch can overheat if left without adequate cooling for
an extended time.
To replace the fan module in a switch, do the following.
1. Gently pull the tab (labeled Air Out or Air In) on the end of the fan module.
The fan module is held in place by spring clips. As you pull, the clips will disengage
and the fan will stop.
2. Slide the fan module out of the switch and set it aside.
3. Verify that the airow direction on the replacement fan module matches that of the
installed fan modules.
Fans with front-to-back airow have red tabs and are labeled Air Out.
Fans with back-to-front airow have blue tabs and are labeled Air In.
4. Carefully slide the replacement fan module into the switch.
Push until the fan module snaps into place. The fan will automatically start to
operate.
Remove the Device from the Rack
These procedures assume that you have attached the device to the rack as described in
one of the following topics:
• Remove the Switch from a Four-Post Rack
• Remove the Switch from a Two-Post Rack on page 75
Remove the Switch from a Four-Post Rack
To remove or reposition a device after you have mounted it in a rack, follow these steps.
1. Disconnect the device from its power source or sources.
2. Remove all cables and transceivers.
3. To remove a device from a four-post rack, do the following:
a. Push the disconnect latch to release the device after it is fully extended.
Remove and Replace Components Remove the Device from the Rack
Extreme 7720 Hardware Installation Guide 73
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