Which printed information must be included by the installer regarding smoke alarms?

The inclusion of testing instructions and replacement timelines is crucial for smoke alarms because it directly impacts their functionality and reliability in fire safety. Smoke alarms are essential devices designed to detect smoke and alert occupants to potential fire hazards; thus, understanding how to test these devices and knowing when to replace them ensures they operate effectively at all times.

Providing testing instructions helps users recognize the importance of regularly checking the smoke alarm's operational status, ensuring that it will function as intended in an emergency. Similarly, replacement timelines inform users about how often they should change the alarm or its components, such as batteries or the entire unit, depending on the manufacturer's guidelines. This information contributes to maintaining a safe environment and minimizing risks associated with fire incidents.

In contrast, while knowledge about battery replacement intervals and installation costs might be relevant, they do not directly impact the operational status and life-safety function of the smoke alarms. Information about the location of fire exits, though essential for evacuation safety, is not specific to the smoke alarms themselves. Thus, the focus on testing instructions and replacement timelines stands out as the most critical information that installers must provide.