Which of the following is essential for the accurate functioning of smoke detectors?

Regular cleaning is indeed essential for the accurate functioning of smoke detectors. Over time, dust, debris, and other contaminants can accumulate in and around smoke detectors, potentially leading to false alarms or preventing the detector from functioning properly in the event of smoke or fire. Keeping the unit clean allows it to detect smoke more effectively, ensuring that it can respond promptly to actual smoke conditions.

While placement height, power source, and type of smoke are all important considerations regarding smoke detectors, they do not directly encompass the regular maintenance aspect that cleaning represents. Placement height ensures the detector can sense smoke effectively, the power source ensures it operates, and the type of smoke represents the different response characteristics of smoke detectors. However, without regular cleaning, even the best-placed or powered smoke detector can become less reliable, highlighting the critical importance of maintenance in fire safety.