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Learn how to prevent work place fires and what to do if a fire breaks out.
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To understand how fire extinguishers work, you need to understand a little about fire. Fire is a very rapid chemical reaction between oxygen and a combustible material, which results in the release of heat, light, flames, and smoke.
For fire to exist, the following four elements must be present at the same time...
Can you select the correct elements?
Portable fire extinguishers apply an extinguishing agent that will either cool burning fuel, displace or remove oxygen, or stop the chemical reaction so a fire cannot continue to burn. When the handle of an extinguisher is compressed, agent is expelled out the nozzle. All portable fire extinguishers must be approved by a nationally recognized testing laboratory Safety Pin, Nozzle, Handle, Pressure gauge, Tube, High Pressure Gas Canister, Dry Chemical, Carbon Dioxide, or Waterto verify compliance with applicable standards.
Important notices for each extinguisher Water Never use water to extinguish flammable liquid fires. Never use water to extinguish an electrical fire. ## CO2 or Dry Chemical CO2 is not recommended for Class A fires because they may continue to smolder and re-ignite after the CO2 dissipates. Never use CO2 extinguishers in a confined space while people are present without proper respiratory protection. ## Class K - Dry and Wet Chemical Extinguishers for Kitchen Fires Do not attempt to use a Class A extinguisher containing water or CO2 on a deep fat fryer fire. An explosive type reaction may result. Travel distance to a Class K extinguisher shall not exceed 30 feet. Install a 2-A water-type extinguisher or 6L wet chemical fire extinguisher for solid fuel cooking appliances with fire boxes. Inspect, test and maintain Class K fire extinguishers yearly.
## Audible alarms include bells, horns, sirens, voice announcement systems, and other devices that can be distinguished above and apart from the normal sound level within the workplace. Temporal and voice signals are the most effective means.
Bells ## Vibrating bells are the most common signal device. Bells are commonly used in schools for fire alarms.
Horns ## Horns produce a very loud distinctive sound that immediately attracts attention. Horns can be useful to call attention to critical situations. Signals other than those used for evacuation purposes do not have to produce the temporal coded signal.
Sirens Sirens produce a loud piercing wail that makes them ideally suitable for initiating a site-wide evacuation.
Workplace Announcement System Speakers can be used to play a live or recorded voice message. They are often ideally suited for large workplaces where phased or guided evacuations are needed.
# Flashing/Steady Lights Speakers can be used to play a live or recorded voice message. They are often ideally suited for large workplaces where phased or guided evacuations are needed.
What should an employer make you aware of?
On site heaters are great for keeping warm but come with their own fire risks. This lesson will go over how to avoid those risks and how to care for a heater.
## When heaters are used in confined spaces, special care shall be taken to provide sufficient ventilation in order to ensure proper combustion.
Heaters not suitable for use on wood floors shall not be set directly upon them or other combustible materials.
Types of heaters Solid fuel salamanders are prohibited in buildings and on scaffolds. Flammable liquid-fired heaters shall be equipped with a primary safety control to stop the flow of fuel in the event of flame failure. Barometric or gravity oil feed shall not be considered a primary safety control. Heaters designed for barometric or gravity oil feed shall be used only with the integral tanks. Heaters specifically designed and approved for use with separate supply tanks may be directly connected for gravity feed, or an automatic pump, from a supply tank.
## Public health laws state that enclosed or substantially enclosed workplaces and public places must be smoke free.
This means that employers have legal responsibilities to prevent people from smoking in relevant premises at work, as well as in certain workplace vehicles.
Employers are required by law to... ## display no-smoking signs in workplaces and work vehicles Take reasonable steps to make sure that staff, customers, members and visitors are aware that they may not smoke in the premises or in work vehicles ## Make sure that no one smokes on the premises or in vehicles
Smoking can lead to fires if not disposed of correctly
Employers should consult their employees and their representatives on the appropriate smoking policy to suit their particular workplace.
A smoke-free policy should aim to protect all staff from the harmful effects of second-hand tobacco smoke, comply with the law and support workers that wish to give up, but also make provision for those unable or unwilling to give up.
Many solids, liquids and gases can catch fire and burn. It only takes a source of ignition, which may be a small flame or an electrical spark, together with air.
What do you think are some very real ignition sources?
Hot work All hot work generating heat, sparks or flame can cause a fire.
Plant and equipment Select electrical and engine driven plant of suitable capacity to prevent overheating. Fasten lamps to a solid backing and, if mounted on tripods, make sure the tripod is stable.
Smoking Bring the rules on smoking to the attention of all workers and visitors to the site and enforce them. Please see other lesson in this course for smoking information.
Electrical installations Should be of sufficient capacity for the intended use and designed, installed, inspected and maintained by competent people.