What is a common indicator of inadequate ventilation in a fire alarm system?

High carbon monoxide levels serve as a significant indicator of inadequate ventilation within a fire alarm system. When ventilation is insufficient, combustion gases from burning materials accumulate, leading to increased concentrations of carbon monoxide. This gas is a byproduct of incomplete combustion and is hazardous to health. The presence of elevated carbon monoxide levels signals that fresh air is not being adequately supplied to dilute the harmful gases generated during a fire or other combustion processes.

In contrast, low humidity readings may indicate dryness in the environment but do not directly correlate with ventilation issues. Stable temperature readings do not signify inadequate ventilation either, as they can occur in well-ventilated or poorly ventilated areas, depending on other factors. Decreasing airflow indicates a potential problem but is generally a precursor to the consequences seen in rising carbon monoxide levels, which more clearly reflects the impact of inadequate ventilation. Therefore, high carbon monoxide levels are the most direct indicator of inadequate ventilation in a fire alarm system.