Figure 2.
The graph plots the probability of inoperability against annual work order occurrences for a building. Multiple curves represent H V A C system components, including heating, cooling, distribution, terminal and controls. All curves decline as occurrences increase, indicating reduced inoperability risk with higher maintenance frequency. The overall H V A C curve remains highest across the range, while cooling and controls decrease more rapidly. The distribution and terminal components show moderate decline patterns. The chart references a negative binomial distribution to model cumulative risk behaviour.HVAC UPM risk profile
Source: Author’s own work