What action must be taken if CAZ depressurization limits are exceeded?

If CAZ (Combustion Appliance Zone) depressurization limits are exceeded, providing makeup air or making modifications is essential for safety and efficient operation. When the pressure in the CAZ becomes too low, it can lead to improper venting of combustion appliances, potentially allowing dangerous combustion gases to enter the living space instead of being expelled outdoors.

By introducing makeup air, either through ventilation systems or physical modifications to the structure, you can restore the balance of air pressure. This action ensures that there is sufficient oxygen for combustion processes while also promoting proper venting of gases. Such measures are crucial for maintaining safety standards and preventing the risk of harmful exposure to carbon monoxide and other pollutants.

In contrast, reducing appliance output, increasing chimney height, or performing routine maintenance may not directly address the underlying issue of insufficient air supply in the CAZ. These alternatives could potentially fail to rectify the depressurization problem, which could still compromise safety. Therefore, providing makeup air or making necessary modifications remains the most effective and recommended response when CAZ depressurization limits are exceeded.