Extreme Networks Extreme 7520 Series Hardware Installation Manual page 77

Remove and Replace Components Remove the Switch from a Two-Post Rack
If the device cannot be tilted (because other equipment is mounted directly above
and below), remove one or two mounting brackets from the device and then slide
the device out.
If you plan to use the device again later, store it with the mounting brackets attached.
Extreme 7520 Hardware Installation Guide 77