Supply Of Combustion Air; Combustion Air Supply In Mobile Homes; Air Supply In Conventional Houses - Osburn 2200 Installation And Operation Manual

2200 Installation and Operation Manual
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 where the stove is installed. The CO detector will provide
warning if for any reason the wood stove fails to function correctly.
8.5.1 COMBUSTION AIR SUPPLY IN MOBILE HOMES
Only a wood stove certified and labelled as 'mobile home approved' may be installed in a mobile
home. This Osburn 2200 stove is 'mobile home approved'. Wood stoves installed in mobile homes
must have a ducted supply of combustion air from outdoors. This air supply should be routed
down through the house floor into the vented crawl space under the mobile home. The air supply
duct should be non‐combustible aluminum flex duct with a screened weatherhood on the outside
end.
Note: Fabric duct may also be used, provided it is suitable for HVAC use and meets the
requirements of ULC‐S110 or UL‐181 Class 1 standards. It must have a non‐combustible insulation
and be corrosion resistant.
Where a mobile home has been converted to a standard house by mounting it on a permanent
basement foundation, the supply of outdoor air is not required.
8.5.2 AIR SUPPLY IN CONVENTIONAL HOUSES
The safest and most reliable supply of combustion air for your wood stove is from the room in
which it is installed. Room air is already preheated so it will not chill the fire, and its availability is
not affected by wind pressures on the house. Contrary to commonly expressed concerns, almost
all tightly‐sealed new houses have enough natural leakage to provide the small amount of air
needed by the stove. The only case in which the wood stove may not have adequate access to
combustion air is if the operation of a powerful exhaust device (such as a kitchen range exhaust)
causes the pressure in the house to become negative relative to outdoors.
Some jurisdictions in the United States require that wood stoves have a supply of combustion air
from outdoors. If you do install an air supply through the wall of the house, be aware that its
pressure can be affected during windy weather. If you notice changes in wood stove performance
in windy weather, and in particular if smoke puffs from the stove, you should disconnect the
outdoor air duct from the stove and remove the duct. In some windy conditions, negative pressure
at the duct weatherhood outside the house wall may draw hot exhaust gases from the stove
backwards through the duct to outdoors. Check the outdoor air duct for soot deposits when the
full system is cleaned and inspected at least once each year.
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