The minimum distance between the bases of chimney flues and the bottom edges of their cleanout openings should be between which two measurements?

The appropriate distance between the bases of chimney flues and the bottom edges of their cleanout openings is essential for ensuring proper function and safety of the chimney system. A distance of 6 to 12 inches is recommended to prevent any potential blockage from soot and debris, which might accumulate in the cleanout opening, while also allowing adequate access for cleaning and maintenance.

This distance helps ensure that the flue gases can move freely without obstruction and minimizes the risk of combustion byproducts entering living spaces. Establishing this spacing correctly is crucial for the overall health of the chimney system, allowing for effective venting of gases and reducing the likelihood of safety hazards such as chimney fires or backdrafting.

Other options do not align with codes and standards, as they suggest distances that are either too shallow or too wide, which could lead to maintenance and operational issues. The range provided in the correct choice balances functional access with safety requirements in chimney installations.