The best fire safety system is a person! The best smoke detector is the human nose but that is only true if the person is alert, awake, and responsible. Since this is not the case 24 hours a day, a reliable, automatic system should be used.
Smoke detectors are good early warning devices, providing time to get out in the event of a fire. Both heat and smoke detectors are available. Have both types in your home. When using these devices, take the following precautions:
Test the devices frequently and make sure battery-operated detectors have new batteries installed at least once a year.
Never place a detector in front of a wall or ceiling air duct outlet.
Make sure they are installed properly and that you have 1 on every
level of you home, including the basement and attic. More detectors
should be installed if you have a large home.