If you're certain you can extinguish it yourself and decide to, always make sure you leave yourself a means of exiting. Keep between the fire and an open exit. Monoammonium phosphate is a finely ground extinguishing agent, which looks like yellow talcum powder. Nitrogen gas is used for propellant. This extinguisher is extremely effective on all five classes of fire but is also extremely messy.
Operation is fairly simple.
Pull the pin through the seal, aim the extinguisher at the base of the fire and sweep from side to side. The extinguisher has a range of about 15 feet. These extinguishers are found in hallways and occasionally in labs. This is a high pressure vessel filled with either 5 or 10 pounds of liquid CO2. It is only to be used on flammable liquid or electrical fires.