How often should one consider replacing a smoke detector in order to ensure optimal safety and functionality within a home or building? Is there a general consensus among safety experts regarding the lifespan of these crucial devices? Given that smoke detectors serve as a primary line of defense against the perils of fire, what factors should influence the decision to replace them? Should one adhere strictly to manufacturer recommendations, or might there be additional considerations, such as the age of the unit, the frequency of false alarms, or environmental factors that could impact performance? Furthermore, is there a need for regular maintenance, and how does this interplay with the replacement schedule? Could it be beneficial to establish a systematic approach to monitoring the condition of smoke detectors, ensuring they are not only in working order but also up-to-date with the latest technological advancements? Or is it sufficient to rely on periodic checks to assess their operational integrity?