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), or applicable provisions of the local
building codes.
3.7.8 Combustion air filtration system
If combustion air contamination from ingested particulate matter is a concern in any installation,
an optional air intake filter may be installed. IBC-supplied air intake filters have a known pressure
drop and fouling factor and should be used as a component of the combustion air system
according to the allowable intake length in Table 4 .
3.7.8 Combustion air filtration system
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