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// CODE SNIPPET

504.3.16 Multistory Common Vent Offsets

Fuel Gas Code 2018 of Colorado > 5 Chimneys and Vents > 504 (IFGS) Sizing of Category I Appliance Venting Systems > 504.3 Application of Multiple Appliance Vent Tables 504.3(1) Through 504.3(7) > 504.3.16 Multistory Common Vent Offsets

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Offsets in multistory common vent systems shall be limited to a single offset in each system, and systems with an offset shall comply with all of the following:

The offset angle shall not exceed 45 degrees (0.79 rad) from vertical.
The horizontal length of the offset shall not exceed 1¹/₂ feet for each inch (18 mm per mm) of common vent diameter of the segment in which the offset is located.
For the segment of the common vertical vent containing the offset, the common vent capacity listed in the common venting tables shall be reduced by 20 percent (0.80 × maximum common vent capacity).
A multistory common vent shall not be reduced in size above the offset.

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