Figure 1: Oilburner air bands provide combustion air.
National Oilheat Research Alliance 3
Chapter 1
Venting
A properly functioning venting system
of an oil-burning appliance removes all of
the combustion gases from the appliance
and safely directs them to a point outside
the building.
The proper venting of combustion gases
is an extremely important function, one
which relies on the performance of the
entire venting system. The consequences
of a malfunctioning venting system (im-properly
pitched and assembled flue pipes,
and/or a deteriorating chimney) could lead
to property damage, illness or even death from
carbon monoxide poisoning.
This booklet will explain the various types
of venting systems available for today’s oilheat
appliances, including:
• Chimney vent
• Power vent
• Direct vent
Before examining the various venting op-tions
available, it is important to understand the
need for adequate air to support combustion,
dilution and ventilation. Air typically enters
a building by infiltration (leaks around the
foundation, building penetrations, windows
and doors).
Combustion air is the air that enters the
burner through the air bands and mixes with
oil during the combustion process. Figure 1.
Dilution air is the air drawn into the vent
system through the draft control or other open-ings.
Figure 2 below.
Ventilation air is air around an appliance
that prevents the area from overheating during
appliance operation.
Figure 2: The draft regulator provides dilution air.