What is stated about changes in chimney dimensions when passing through a wall?

When a chimney passes through a wall, there are specific guidelines regarding changes in its dimensions. The regulation states that no change in dimensions is required within a specified distance, typically 6 inches. This allows for a degree of structural integrity and alignment, ensuring that the chimney can maintain its function without compromising safety or performance.

This provision is crucial because it provides flexibility during installation while still adhering to safety standards. If there were mandatory changes outside of this 6-inch boundary, it could complicate installation processes and potentially introduce risks if not done correctly.

Understanding this guideline helps inspectors ensure compliance with building codes, thereby maintaining safety standards in residential construction involving chimneys.