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).
3.7.8 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 .
Flue gas exhaust to outdoors
P-357 Air intake filter
3-inch schedule 40 pipe
Figure 31 Direct vent - intake, exhaust system with optional air intake filter (filtration may also be
used on indoor air applications as required)
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