Where an exhaust passes through a sidewall too close to a soffit, the venting must
extend past the soffit by transitioning to vertical as shown below.
Figure 23 Sidewall vent termination transition to vertical to clear soffit
This illustrates the scenario where indoor air is used for combustion. Where combustion air is
drawn from outdoors, combustion venting should also transition to vertical and terminations
should observe the limitations shown for rooftop terminations.
3.7.7 Indoor air combustion air intake
An “Indoor Combustion Air installation” can be described as air for combustion that is taken
from the air surrounding the boiler.
Warning
When using indoor air options, supply adequate combustion air to the boiler room
according to the requirements of all applicable codes.
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