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Installation and Operation Manual
4.0
VENTING FLUE GASES
The WF200 Wood Fired boiler shall be safely vented to the outdoors in accordance with these instructions,
CAN/CSA B365, Installation code for solid-fuel-burning appliances and equipment, and the National Building
Code.
Chimney
Only a chimney meeting one of the criteria listed below (a or b) shall be used to vent the flue gases from the
WF200 boiler. When connecting to an existing chimney it must be inspected thoroughly before firing the
equipment.
a) a masonry chimney conforming to provincial or territorial regulations or bylaws, or in the absence
thereof, to the National Building Code; or
b) a factory-built chimney conforming to CAN/ULC-S629; often referred to as "All-fuel" chimneys (Not
Applicable for U.S. installations). The appropriate clearance of these chimneys from combustible
materials is specified in the manufacturer's installation instructions and also the listing label of the
chimney selection.
The chimney and flue pipe must be clean and in good condition to avoid the risk of fire.
Chimney Connector
Usually a few feet of flue pipe (single wall) are used to connect the boiler to the chimney and in such cases, this
section of the venting system is called a chimney connector. A great number of fires associated with wood
burning appliances are due to unsafe connector installations. The following requirements are designed to prevent
two hazards: 1) ignition of the surroundings, principally by radiant heating, and 2) inadequate draft, which could
result in serious smoke concentrations in the house. The minimum thickness of steel used for the chimney
connector must conform to the Table below.
Each flue joint should be secured with at least 3 metal screws or equivalent. Outside mechanical support should
be used if the connector is more than 6 feet long. The flue pipe should be accessible for inspection, cleaning and
possible replacement. If the flue pipe connects to an existing chimney, the pipe should penetrate through the
inner surface of the masonry wall, but not beyond (not into the space itself). The connection should be made
physically secure such as through the use of high temperature cement.
A flue pipe serving a solid fuel appliance shall:
a. Be securely supported by metal or other non-combustible supports.
b. Be as short and straight as possible.
c. Not exceed a maximum 10-foot horizontal run.
d. Be designed and constructed to allow for expansion.
e. Be sloped upward toward the chimney at least ¼ inch per foot of horizontal run.
f. Have a cross-section area no less than: 1) The area of the flue outlet of the appliance served by a flue pipe,
2) The combined area of the flue outlets of all the appliances served by a breeching.
g. Enter the side of a chimney through an approved metal thimble or masonry flue ring.
h. Not extend into the chimney flue.
i.
Have a tight connection with the chimney.
j.
Have installed at least three sheet metal screws to secure each length of flue pipe where they are joined and
where it is attached to the wood boiler flue outlet.
k. A flue servicing a solid fuel fired appliance should not pass through:
1. Attic or roof space, closet or similar concealed space
2. A floor, ceiling, wall or partition of combustion construction.
6
Minimum Thickness of Metal used in Chimney Connector
Diameter of Flue Pipe, in.
7-8
Minimum Thickness, in.
0.021
WF200
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