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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.
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505.2.3 General Building Heights and Areas, Openness
, a mezzanine having two or more exits or access to exits shall not be required to be open to the room in which the mezzanine is located ...