Warnings
In addition to preventing ingestion of chemical contaminants, ensure air intake
terminals are not installed in locations where contamination might occur due to
ingestion of particulate foreign material (dust, dirt and debris).
Configure intake air openings, so that rain or other forms of moisture cannot enter the
air intake piping system. Otherwise serious damage to the boiler may result.
Flue gas exhaust to outdoors (connection at
rear of boiler)
Flue gas exhaust to outdoors
Combustion air from outdoors. "Direct Vent"
installation: check air intake outside is clear
of obstructions.
Combustion air from outdoors. Use reducing
coupling to transition from 4" connection to 6"
venting before first elbow.
Boiler supply
Boiler return
Figure 18 Direct vent combustion air intake Figure 19 Combustion air intake - side view
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