An important consideration is managing the impact of the steam plume normally at the exhaust
terminal of a condensing boiler. Generally, intake and exhaust pipes should terminate at a rooftop or
sterile wall location to maximize customer satisfaction. Keep exhaust plumes well away from all
building air intakes including those of neighboring properties.
Flue gas exhaust to outdoors
Figure 10 Flue gas venting
Danger
Do not common vent EX series modulating boilers with any other existing or new appliance.
3.5.1 Code
All venting must be installed in accordance with the requirements of the jurisdiction having authority:
in Canada, Part 8, Venting Systems of the B149.1-10 Code and any other local building codes are to
be followed. In the USA, the National Fuel Gas Code, ANSI 223.1, latest edition, prevails. Where
there is a discrepancy between the installation instructions provided, and the code requirements,
apply the more stringent.
Provisions for the combustion and air ventilation must be in accordance with the section “Air for
Combustion and Ventilation” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or Clause 8.2,
8.3 or 8.4 of the Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable
provisions of the local building codes.
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