Flue gas exhaust to outdoors
P-357 Air intake filter
3-inch schedule 40 pipe
Figure 25 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).
3.9 Installing a condensate trap
IBC’s specified vent configuration promotes the safe drainage of moisture from the boiler and
exhaust venting without flowing liquids back through the heat exchanger (as done by some other
condensing boilers).
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