Dry chemical extinguishers are not temperature sensitive. The smaller ones are charged with nitrogen at the factory, the 20 pound size and up use carbon dioxide cartridges. Dry chemical extinguishers can be used on the following types of fires
Class A: ordinary combustibles (wood, paper, plastics)
Class B: flammable liquids (oils, gasoline, solvents)
Class C: energized electrical equipment
Dry chem extinguishers are rated for their extinguishing capabilities. A 2A, 10 BC extinguisher wil extinguish a fire in ordinary combustibles covering a two square foot area, a 10 square foot area of a flammable/combustible liquid fire. The C indicates that it can be used on energized electrical equipment. The ratings are based on the amount of fire a non trained person should be able to extinguish. In the hands of trained personnel, the area can be doubled
If you have a fire extinguisher, take it out and read the instructions from time to time. Check the operating pressure at least once a month. Some extinguishers have a pressure test pin in addition to a pressure gauge.Follow the manufacturer's instructions. If there is not enought pressure, the extinguisher will not work properly. Some extinguishers are one time use only, others can be recharged by a fire extinguisher service company. The larger sizes (10, 20 and 30 pound extinguishers) can be recharged
To operate an extinguisher, remember the mnemonic PASS
P: Pull the pin
A: Aim the extinguisher at the base of the flames
S: Squeeze the handle to expel the extinguishing agent
S: Sweep the fire extinguisher from left to right, starting at the leading edge of the fire and pushing it back
Once the fire is out, back away from the fire...never turn your back on it. Always call the fire department if you use a fire extinguisher. Let them investigate the fire and insure that it is really out ( I can't tell you how many fires I have been to that were thought to be out when someone used an extinguisher!)
TooFastGTP...
It' s great that your home has a fire sprinkler system. You should still keep a dry chemical extinguisher in the kitchen, though. A small burst from a dry chem extinguisher can extinguish a fire in it's incipient phase. A sprinkler head reacts when the ceiling temperature reaches the melting point of the fusible link or the frangible glass bulb.
Other important fire and life safety devices to have in your home are smoke detectors and carbon monoxide detectors. I have heat detectors in my garage, which are tied into to my hard wired smoke detector system.