According to the National Fire Protection Association, smoke alarms should be installed in every bedroom, outside each sleeping area, and on every level of the home. In addition, smoke alarms should be interconnected so that if one sounds, they all sound. This ensures that everyone in the house is alerted in the event of a fire. nnThe legal requirement for smoke alarms may vary from state to state, but it is generally recommended that they be installed in accordance with the NFPA guidelines. By following these guidelines, you can help to ensure the safety of your family in the event of a fire.