How many feet must a chimney extend above the highest connected gas appliance?

The requirement for a chimney to extend above the highest connected gas appliance is set to ensure proper ventilation and create adequate draft for the safe operation of the appliance. Extending the chimney adequately above the highest point of the connected equipment reduces the risk of downdrafts and ensures that combustion byproducts are effectively vented away from the structure.

In this case, a chimney must extend at least five feet above the highest connected gas appliance. This helps maintain a safe and efficient venting system, minimizing hazards associated with gas appliances, such as carbon monoxide accumulation or improper combustion.

While other options may suggest different heights, they do not meet the standards established for the effective and safe operation of gas appliances. Adhering to the five-foot extension guideline is crucial for both compliance with safety codes and protection against potential hazards related to gas venting.