Juniper T1600 Hardware Manual page 263

Copyright © 2010, Juniper Networks, Inc.
When the FPC is out of the chassis, do not hold it by the ejector handles,
bus bars, or edge connectors. They cannot support its weight.
Do not stack FPCs on top of one another after removal. Place each one
individually in an electrostatic bag or on its own antistatic mat on a flat,
stable surface.
Repeat the procedure for each remaining FPC.
12.
If you are not reinstalling a FPC into the emptied FPC slot within a short time, install
13.
a blank FPC panel over the slot to maintain proper airflow in the FPC card cage.
CAUTION: After removing an FPC from the chassis, wait at least 30
seconds before reinserting it, removing an FPC from a different slot, or
inserting an FPC into a different slot.
Chapter 17: Replacing T1600 Router Hardware Components
239