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FGC § 503.10.4.1
Where two or more openings are provided into one chimney flue or vent, the openings shall be at different levels, or the connectors shall be attached to the vertical portion of the chimney or vent at an angle of 45 degrees (0.79 rad) or less relative to the vertical in accordance with Figure 503.10.4.1. Figure 503.10.4.1Opposing Openings in Chimney
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