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// CODE SNIPPET

M1801.11 Multiple-Appliance Venting Systems

Residential Code 2021 of Colorado > 18 Chimneys and Vents > M1801 General > 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:
  1. 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.
  2. Inlets to common venting systems shall be offset such that no portion of an inlet is opposite another inlet.
  3. Connectors serving appliances operating under a natural draft shall not be connected to any portion of a mechanical draft system operating under positive pressure.

Related Code Sections


M1801.11 Chimneys and Vents, Multiple-Appliance Venting Systems
Two or more listed and labeled appliances connected to a common natural draft venting system shall comply with the following requirements ...
Residential Code 2021 of Colorado > 18 Chimneys and Vents > M1801 General > M1801.11 Multiple-Appliance Venting Systems
R1003.14 Chimneys and Fireplaces, Flue Area (Appliance)
sizing of a chimney flue to which multiple appliance venting systems are connected shall be in accordance with Section M1805.3. TABLE R1003.14 ...
Residential Code 2021 of Colorado > 10 Chimneys and Fireplaces > R1003 Masonry Chimneys > R1003.14 Flue Area (Appliance)
504.3.18 Chimneys and Vents, Multiple Input Rate Appliances
For appliances with more than one input rate, the minimum vent connector capacity (FAN Min) determined from the tables shall be less than the lowest ...
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) > 504.3.18 Multiple Input Rate Appliances
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