Watchguard Firebox V200 Hardware Manual page 24

All fan cards have two latching screws that fasten the card to the chassis.
The following figure shows the screws when they are unlatched.
To replace a fan card:
1
2
3
Fans will continue to rotate as you pull out the card. Keep fingers, hair,
and all objects clear of the rotating fans until fans stop.
To prevent personal injury or damage to the board or system, do not insert
your fingers, tools, or anything else into the appliance when a fan card is
removed. When one fan card is removed, the blades on the other fan card
continue to spin to provide cooling as long as the appliance is powered. Do
not leave the appliance unattended when a fan card is removed.
14
Unscrew the two latching screws that hold the fan card in place.
Attach an ESD strap to your wrist and to the grounding connector at
the back of the unit before opening the appliance or removing any
card or module. Electro-Static Discharge, ESD, can damage the board
or system. Wear the ESD strap at all times while handling both old
and new cards and modules.
Note: The appliance must be plugged in to a properly grounded
outlet for the grounding connector to function.
Grasp the metal handle of the fan card and pull the card part of the
way out of the chassis (about one inch out from the installed position).
Wait five to ten seconds for the fans to stop spinning before removing
the fan tray the rest of the way from the chassis. Some fans may still be
moving.
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WatchGuard Firebox V200