First, buy smoke alarms that have passed Underwriters Laboratories or Factory Mutual tests. At least one smoke alarm should be placed on every level of the home. Smoke alarms should be located near bedrooms or in every bedroom. Many building codes now require them in all bedrooms. According to the NFPA, residential fire detection systems rely mainly on smoke alarms.
Heat alarms are a supplement to the smoke alarms.
When the temperature in the room reaches the preset temperature of the alarm, the alarm will sound. Although the horn may sound when the test button is pressed, this does not mean the unit will operate in the presence of smoke when the alarm has reached its maximum service life. We cannot, however, guarantee the performance of all items demonstrated or described in all situations. Always consult an experienced contractor or other expert to determine the best application of these ideas or products in your home.