For optimal performance, where should environmental alarms be placed?

Placing environmental alarms at the highest point of the ceiling is crucial for their optimal performance. This positioning allows the alarm to effectively detect changes in environmental conditions such as temperature, smoke, or gas accumulation, which typically rise due to convection. By placing alarms high, they can respond promptly to any potential threats as harmful substances tend to accumulate in higher areas before dispersing.

Additionally, placing alarms in this manner helps reduce the likelihood of false readings that can occur in areas with drafts or obstructions. This ensures that the alarms can accurately monitor the environment and function as intended, providing timely alerts when necessary.

The other placements suggested would likely interfere with the effectiveness of the alarms. For instance, positioning alarms near external doors could expose them to sudden environmental changes or drafts that might trigger false alarms. Direct sunlight might cause overheating or affect the alarm's sensors, while areas of high humidity could lead to water damage or false triggers, further emphasizing the benefits of the recommended placement.