3.7.7 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
Combustion air in - check air intake outside
to make sure it is clear of obstructions.
Air intake filter - check and clean air filter
regularly
Figure 30 Direct vent - intake, exhaust system with optional
air intake filter (filtration may also be used on indoor air
applications as required)
3.8 Closet installations
For installations in a confined space (such as a closet), ventilation openings may be needed
through a door or wall to prevent excessive heat from building up inside the space.
The appliance must not be exposed to surrounding air above 122°F (50°C) or below 32°F (0°C).
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