| 9.22.3.1. |
Thickness of Walls
- Except as provided in Sentence (2), the thickness of the back and sides of a fireplace, including the thickness of any firebrick liner, shall be not less than 190 mm where a metal liner or a firebrick liner less than 51 mm thick is used.
- When a steel fireplace liner is used with an air circulating chamber surrounding the firebox, the back and sides of the fireplace shall consist of
- solid masonry units not less than 90 mm thick, or
- hollow masonry units not less than 190 mm thick.
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