Drolet WOOD STOVE Operations Instructions download pdf (Page 54)

Tundra Furnace Installation and Operation Manual

8.5 Supply of combustion air

In Canada, wood furnaces are not required to have a supply of combustion air from

outdoors 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 furnace is

installed. The CO detector will provide warning if for any reason the wood furnace fails to

function correctly.

8.6 Air supply in conventional houses

The safest and most reliable supply of combustion air for your wood furnace 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 furnace. The only case in which the wood

furnace 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 furnaces 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 furnace performance in windy weather, and in particular if smoke puffs from the

furnace, you should disconnect the outdoor air duct from the furnace 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 furnace 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.

8.7 Installing the chimney connector

The chimney connector is the single or double wall pipe installed between the furnace flue

collar and the chimney breech. Single wall pipe components are available from most

hardware and building supply stores. These components are not usually tested to a

particular standard and certified as compliant. Therefore, a list of rules found in solid fuel

installation codes applies to the installation of single wall pipe.

Double wall chimney connectors are tested and certified. The rules for double wall pipe are

found in the manufacturer’s installation instructions. These rules will be very different than

those for single wall.

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Drolet WOOD STOVE Operations Instructions Page 54