Drolet YUKON Instructions Manual page 15

WHAT IS THE DIFFERENCE BETWEEN TYPE A AND TYPE L CHIMNEY?
Type A chimneys have insulation. Type L chimneys have a double wall. It is the air "cushion" that creates the
insulation on a Type L chimney. Drolet recommends the use of a Type A chimney for its oil stoves.
WHERE CAN I FIND AN INSTALLER FOR MY OIL STOVE?
There are many companies specializing in the installation of heating equipment, including oil burning stoves. Your
dealer may have its own installation service or may be able to refer a qualified installer for your region. If your
dealer cannot put you in contact with an installer, consult your local directories and look for companies specializing
in "plumbing, heating, and ventilation". Companies that provide installation and maintenance services for fuel oil
furnaces can often install all king of oil burning equipment, including oil stoves. Drolet has a database with the
name of many installers across Canada. Contact us so that we verify if we can refer a qualified installer for your
region.
WHAT DO THE WORDS "DRAFT" AND "NEGATIVE PRESSURE" MEAN?
The word "draft" refers to the hot air movement that circulates in your stove's exhaust system, going from the stove
to the outside of the house, and carrying with it the combustion residues. The draft is a natural phenomenon. Hot
air weights less than cold air, causing it to rise. This is why the higher the temperature in the exhaust system, the
stronger the draft. It is also important to say that the "tunnel effect" created by the exhaust system contributes to
increasing the draft effect. This is why chimneys that are excessively long often create excessive draft, while
chimneys that are abnormally short will have an excessively low draft.
"Negative pressure" can be seen as a "reverse draft". That is, air will circulate from the chimney toward the interior
of the house. Negative pressure is often what causes smoking problems. In general, negative pressure is the
result of either one or a combination of the three factors explained below:
1- A cold chimney. Cold air, which is heavier that hot air, has a tendency to go down the chimney and create
the effect of a "clog". This explains why a stove that has not worked for a long time and which chimney is
very cold will sometimes be hard light. (consult drawing #2C).
2- Negative pressure can also occur as a result of a "vacuum effect" in the room or the house. The air in a
house is constantly moving. Hot air rises, cold air moves down. Air can also be expulsed outside of the
house with the use of air-moving equipment, such as a range hood, a air exchanger, a bathroom fan, a
dryer, etc. Furthermore, air goes in and out of the house through cracks, doors, windows, etc. If air leaves
a room without being replaced, a "vacuum effect" is created. Therefore, if a house is well insulated and all
windows are closed, the room will source its air through the easiest alternative route, which is often your
stove's exhaust system. This creates a negative pressure in your exhaust system. You now understand
why it is often suggested that a window be slightly open in the room where the stove is located. This
enables the room to easily source its air outside the house without searching for an alternative route. The
vacuum effect can be amplified when your stove is located in the basement. This is due to the fact that
your house itself acts like a chimney. Since hot air will rise to upper floors in the house, it will "draw" air
from the basement of the house. This is called the "chimney stack effect". (consult drawings #3C).
3- Wind can also be a third cause of negative pressure. When your house is located near a structure which
height is superior to your chimney's, wind currents can create an interference with your chimney, leading
to negative pressure problems. (consult drawing #4C and #5C).
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