Why should a smoke detector not be placed above 25 feet?

Placing a smoke detector above 25 feet can hinder its effectiveness due to the effects of stratification. In high spaces, smoke and heat tend to rise, creating layers or stratifications of air. If a smoke detector is installed too high, it may not detect smoke efficiently because the smoke may not reach the detector in sufficient concentration before it disperses or settles into a cooler layer of air. This spatial separation can cause delays in detection, which might diminish the response time in a fire scenario.

While considerations about damage, access, and monitoring height are relevant factors in the installation of smoke detectors, they do not undermine the critical importance of ensuring that detectors are placed where they can optimally sense smoke. Stratification directly impacts the functionality of a smoke detector, making it the primary reason for the height limitation.

This understanding emphasizes the need for strategic placement of fire detection devices to ensure they operate effectively in potentially life-threatening situations.