Different extinguishers each work best on different classifications of fires. Class B and C fires respond well to CO2 extinguishers. Class A fires, fueled by paper, plastic or wood, are less well-matched with CO2. Although it may initially extinguish the flames, once the CO2 dissipates, the fire may re-ignite. Fires involving combustible metals (Class D) are never treated with CO2; the chemical reactions present in that type of fire actually may be accelerated.
All extinguishers operate by delivering a pressurized agent to help starve the flames of one of the fire’s essential ingredients: heat, oxygen, or basic fuel. The carbon dioxide delivered by a CO2 extinguisher is a non-flammable gas and works by starving the fire of oxygen.
While inside the canister, the carbon dioxide is pressurized into a liquid form. As the CO2 extinguisher discharges, the carbon dioxide turns into a fine mist. It is extremely cold due to its pressurized liquid form; occasionally bits of dry ice will discharge along with the mist. The horn or nozzle never should be directly touched during use because the skin can freeze to the surface.
The force and noise associated with discharging a CO2 extinguisher is quite high due to the elevated level of pressure inside the canister. Operating it requires a strong grip on the canister while making sure that the nozzle is pointed from the body. Some delicate electronic equipment may be damaged by the force of the discharge. Other clean agent extinguishers that also leave minimal residue might be better for those situations. In kitchen-related fires and in electrical and appliance fires, CO2 extinguishers are a great choice. Commercially, many restaurants and science laboratories also use CO2 extinguishers,
When faced with a fire, think clearly. First and foremost, you are not required to fight a fire. If you are unsure, get out of the area, alert as many others as possible and call the fire department. If you decide to fight the fire, let others know what you are doing. Grab the extinguisher, pull the tab or pin to release the trigger and spray the base of the fire. Stay several feet away; do not stand on previously ignited material for it may re-ignite, and do not let the fire get between you and your exit.
Remember most extinguishers do not have a very long discharge time. If the fire is too large, a home extinguisher will not be able to counteract it. Once an extinguisher has been discharged, get it replaced or recharged immediately so it is ready for the next emergency.
Matthew Kerridge is an expert in home security. If you want further information about varieties of co2 extinguisher or are looking to purchase a co2 extinguisher please visit http://www.adt.co.uk
