Acer AR380 F1 - Manual (Page 61)

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4 Push the new power supply module into the power bay until it
clicks into place.
5 Plug the AC power cord back into the module and power up the
server by pushing the power on button.
Removing and installing the air duct
Caution: Always operate your server with the air duct installed to
ensure reliable and continued operation.
Removing the air duct
1 Perform the pre-installation instructions described on page 26.
2 Lift the air duct from the chassis.
Installing the air duct
1 Perform the pre-installation instructions described on page 26.