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Page 27
Installation and operation manual - Atlas woodburning cookstove
ENGLISH
10. Combustion Air Supply
For the cookstove draft to work correctly, the room must have an outside or fresh air inlet, with
a minimum of 4" diameter, from the house exterior to the room, that is at least sufficient to
replenish the volume of air that comes out of the chimney flue. In well insulated houses an air
inlet must be fitted through the outer wall that is not exposed to the prevailing winds, depending
on the surrounding conditions of the house. If a vent is installed, it must be fitted in such a way
that it cannot be blocked.
The outdoor air must be routed through a duct no more than 300 mm (12") away from the
appliance, in order not to interfere with its operation. A watertight mechanical valve will close
the air inlet when the cookstove is not used. Protection against rodents must be installed on
external edge.
When the cookstove and the chimney are completely cold, it may be necessary before starting
up to provide an external air supply by opening a door or a window for a short period. A
house constructed or renovated in a waterproof manner is prone to not having the air exchange
required for the proper functioning of a wood heating appliance.
In that case, avoid, during startups, to use appliances that evacuate air outside of the house,
such as:
• Cookstove hood
• Bathroom vent
• Air exchange system
• Ventilated central vacuum cleaner
• Dryer
The supply of fresh combustion air can be done in several ways, provided they comply with CSA
B365 and NFPA211.
11. Chimney Connector Installation
The chimney connector is the single or double wall pipe, installed between the cookstove and
the chimney. The components of the single wall pipe are sold in most hardware or construction
supply stores. These sections usually do not comply with a precise standard and are not certified.
Consequently, several rules found in the heating appliance installation codes are applied to the
installation of the single wall pipe.
The double wall chimney connectors have gone through testing and are certified. The rules
for double wall pipes are found in the manufacturer’s installation guide. These rules are very
different from the single wall pipes.
11.1 Single Wall Chimney Connector Installation
The entire chimney connector has been called "the weak link" in the security of the wood heating
system because if the connector is not properly installed, it can provoke a fire.
The best smoke pipe installation goes straight from the cookstove to the base of the chimney
with no elbow. Straight installation will cause fewer problems such as smoke returns when the
door is open to reload the appliance. They are also more stable and easier to maintain than
installations with elbows. Avoid, as much as possible, horizontal smoke pipes sections because
they reduce the chimney draft and are more conducive to creosote accumulation.
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