For open joisted ceilings, what regulation affects the spacing of heat detectors?

In the context of fire alarm systems, particularly for open joisted ceilings, the regulation regarding the spacing of heat detectors is influenced by the unique design of the ceiling. Open joisted ceilings can create spaces that allow for greater airflow and potential heat movement, impacting the effectiveness of heat detectors.

When heat rises, it can travel differently in spaces where there are large air volumes and open structures. As a result, the maximum spacing for heat detectors is mandated to be reduced in these environments compared to traditional ceilings. This regulation ensures that heat detectors are appropriately placed to effectively detect rising temperatures within the space and provide timely alerts in the event of a fire.

By reducing the spacing, the likelihood of early fire detection increases, enhancing the overall efficacy of the fire alarm system. This is particularly crucial in open areas where fire may spread quickly and where conventional placement guidelines may not offer adequate protection due to the architectural features.