Assure proper clearance of single wall pipe is maintained. Do not penetrate a combustible ceiling or wall with only a single wall pipe. Make sure no other appliance is vented into your existing chimney. Make sure your smoke alarm is working, most of these have a test button. If you don't have one you should get one.
Smoke alarms save lives.
This extinguisher will work on electrical, flammable liquid, or solid combustible type fires. Many of the preceding steps should be done a minimum of once a month. Do not burn trash, paper or cardboard in your appliance, this also increases the chance of a chimney fire. Never light your stove using gasoline, paint thinner, fuel oil, or any other type of accelerant. Many of these will cause an explosion and result in severe burns.