What must solid-fuel burning appliances be limited to?

The correct answer is that solid-fuel burning appliances must be limited to one appliance per one flue. This requirement is in place to ensure safe and efficient venting of combustion gases. When a single stove, fireplace, or other solid-fuel-burning appliance is used with its dedicated flue, it minimizes the risk of backdraft or the mixing of exhaust gases from different appliances, which can lead to safety hazards. Properly venting a single appliance through its own flue allows for better control of airflow, facilitates effective removal of combustion byproducts, and helps prevent flue gas spillage into living spaces.

This practice is also reinforced by building codes to maintain clarity in maintenance and inspection processes. Utilizing multiple appliances with one flue can complicate conditions within the chimney, create excessive creosote buildup, and pose serious risks, including chimney fires and carbon monoxide poisoning. Thus, for safety and compliance with the North Carolina Mechanical Code, having one appliance vented through one flue is the standard.