I know this is horrible but my fire alarm has gone off dozens of times in the past 3 years (in my condo building) and only once was there a real fire. Some weekends it would go off every 30 minutes. It's gotten to the point where I don't leave the building until I see the fire trucks pull up. If the fire fighters are in a hurry, so am I...if they get out of their truck like they're getting ready to go buy doughnuts, I know it's another false alarm and wait for them to shut it off.