A Fire Extinguisher will be required in rooms where fires are likely to break out. A Janitor will be able to run to the Fire Extinguisher and well... Extinguish the fire.
All machinery has the possibility of catching fire if it isn't maintained very well. Having a fire extinguisher nearby will help a Janitor locate one quickly and easily allowing them the extinguish the fire before the machine explodes.
Fire Extinguishers require no maintenance.
For a full list of machinery that may catch fire and require a Fire Extinguisher, see HERE.
Original Tooltip - Sneezes anti-fire foam and doubles as a doorstop. If a machine breaks down i may start a fire.