What defines the CAZ Worst Case Configuration?

The CAZ Worst Case Configuration is defined as the baseline configuration where exhaust appliances are arranged to create negative pressure within the combustion appliance zone (CAZ). This configuration is important because it simulates the worst-case scenario for combustion appliances, highlighting potential issues such as backdrafting or inadequate venting. In a negative pressure scenario, exhaust gases may be pulled back into the home instead of being expelled safely outside, which can lead to hazardous conditions, including the potential for carbon monoxide accumulation.

This configuration is key for safety testing because it helps identify how appliances will perform under adverse conditions, ensuring that proper venting and air supply measures are in place to mitigate risks. Understanding this configuration is critical for professionals who assess the safety and efficiency of combustion appliances in residential settings.