Flue gas exhaust to outdoors
Combustion air from boiler room. For indoor air installation, check air intake and boiler
room combustion air opening(s) to ensure they are clear of obstructions.
Figure 24 Indoor combustion air intake
To support combustion, an ample air supply is required. This may require direct openings in the
boiler room to the outside. If the boiler is not in a room adjacent to an outside wall, air may be
ducted from outside wall openings.
Provisions for combustion and ventilation air must be made as follows:
in the USA, in accordance with the National Fuel Gas Code, ANSI Z223.1 (latest edition),
or applicable provisions of the local building codes
in Canada, in compliance with B149.1 (latest edition).
3.5.10 Combustion air filtration system
A built-in combustion air filter system is supplied with the boiler, and is located at the top of the
appliance. The boilers use a 10" x 10" x 1" (MERV 8) filter.
End users will need to be instructed on how to maintain the filter in the boiler. For instructions on
how to replace the filter, see Replacing the air filter on page 102.
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