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M1801.11 Multiple-Appliance Venting Systems
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Two or more listed and labeled appliances connected to a common natural draft venting system shall comply with the following requirements:
Appliances that are connected to common venting systems shall be located on the same floor of the dwelling.
Exception: Engineered systems as provided for in Section G2427.
- Inlets to common venting systems shall be offset such that no portion of an inlet is opposite another inlet.
- Connectors serving appliances operating under a natural draft shall not be connected to any portion of a mechanical draft system operating under positive pressure.