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8.6.1 Installation of Single Wall Chimney Connector
The chimney connector assembly has been called 'the weak link' in the safety of wood heating
systems because failure to install the connector properly (which has been common in the past)
can result in house fires.
The best flue pipe assembly is one that rises straight up from the stove to the base of the
chimney with no elbows. Straight assemblies are less likely to cause problems like smoke roll-
out when the door is opened for loading. They are also more stable and easier to maintain than
assemblies with elbows. Horizontal runs of flue pipe should be avoided where possible because
they reduce chimney draft.
Figure 26: Best
The rules below are based on those found in the CSA B365 installation code. Please carefully
follow these installation instruction rules, or those enforced by the local code.
• Maximum overall length of horizontal pipe: 3 m (10 ft.) including elbows.
• Minimum clearance from combustible material: 450 mm (18 in.). The minimum clearance may be
reduced by 50 percent to 225 mm (9 in.) if suitable shielding is installed either on the pipe or on the
combustible surface.
• The assembly should be as short and direct as possible between the stove and chimney. The use
of two 45 degree elbows is often preferable to a single 90 degree elbow because less turbulence is
created in the exhaust flow and they result in less horizontal run.
• Maximum number of 90-degree elbows: 2.
• Maximum unsupported horizontal length: 1 m (3 feet).
• Galvanized flue pipes must not be used because the coatings vaporize at high temperatures and
release dangerous gases. Use black painted flue pipes.
• Flue pipes must be at least 24 gauge in thickness.
• Flue pipe joints should overlap 30 mm (1 1/4 in.)
Installation and Operation Manual - Harmony 2.3
Figure 27: Acceptable
Figure 28: Avoid
Page 41
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