How does carbon dioxide extinguish fire and what danger does it pose to personnel? It is heavier than air and displaces the oxygen, makes oxygen level less than 15%. … Must be able to deliver for 30 seconds to 3 minutes depending on the hazard.
How does carbon dioxide extinguish a fire?
Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
What danger to personnel exist when a carbon dioxide fire extinguisher is discharged in a small enclosed space?
When a CO2 extinguisher is used in a confined space there is danger that the user may become overwhelmed by the sudden increase in carbon dioxide emissions. This occurs as CO2 is an asphyxiant, and the confined space means oxygen will be replaced by the CO2 much faster.
What is the best defense against fire?
As always, the best defense against a fire is to be prepared. Take a moment to look at your fire extinguisher.
Can CO2 fire extinguishers be used on any fire?
Carbon dioxide extinguishers do not leave any residue, unlike a foam extinguisher. They can also be used on Class B fires, those involving flammable liquids such paraffin or petrol. CO2 extinguishers work by smothering the fire and cutting off the supply of air.