Virtually all fires start small and might be extinguished if the proper type and amount of extinguishing agent were applied. Fire extinguishers are the first line of defense against fire. Whether an extinguisher is effective often depends on how you use it. However, an alarm should be given and security notified at extension 13 as soon as a fire is discovered. Notification should NEVER be delayed in the hope that the extinguisher will be sufficient. Please read the following guidelines to help you understand the different classes of fires, the different types of fire extinguishers and the correct operation of fire extinguishers.