Why The Chimney Should Penetrate The Highest Heated Space; Supply Of Combustion Air - Enerzone Solution 3.5 Manuel D'installation Et D'utilisation

Report prepared for: Guillaume Thibodeau-Fortin (Stove Builder International Inc.) on 9/6/2018 2:01:07 PM
1 - Installation Manual English (38 of 57)

8.4.2 Why the chimney should penetrate the highest heated space

When it is cold outside, the warm air in the house is buoyant so it tends to rise. This tendency of
warm air to rise creates a slight pressure difference in the house. Called 'stack effect', it produces
a slightly negative pressure low in the house (relative to outside) and a slightly positive pressure
zone high in the house. If there is no fire burning in a heater connected to a chimney that is shorter
than the warm space inside the house, the slight negative pressure low in the house will compete
against the desired upward flow in the chimney.
There are two reasons why the
chimney in the house at right will
cold backdraft when it is cold outside
and there is no fire burning in the
stove. First, the chimney runs up the
outside of the house, so the air in it is
colder and denser than the warm air
in the house. And second, the
chimney is shorter than the heated
space of the house, meaning the
negative pressure low in the house
will pull outside
chimney, through the stove and into
the room. Even the finest stove will
not work well when connected to this
chimney.

8.5 Supply of Combustion Air

In Canada, wood stoves are not required to have a supply of combustion air from outdoors (except
in mobile homes) because research has shown that these supplies do not give protection against
house depressurization and may fail to supply combustion air during windy weather. However, to
protect against the risk of smoke spillage due to house depressurization, a carbon monoxide
(CO) detector/alarm is required in the room in which the stove is installed. The CO detector will
provide warning if for any reason the wood stove fails to function correctly.
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Stove Builder International Inc. | 44826 | Rev: Aug 31 2018 3:17PM | Uncontrolled Copy
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Solution 3.5 Installation and Operation Manual
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