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6.0 CHIMNEY INFORMATION
Natural Draft Applications
CAUTION:
Gas
fired units must always be connected to flues with proper draft.
Specific guidelines should be followed to prevent the occurrence of the following conditions:
•
Reverse flow of flue gas during or after burner shutdown.
•
Positive outlet draft conditions.
•
Condensation of flue gasses
Chimney Connection
To insure safe and efficient boiler operation flue gasses must be released through a clean,
properly sized chimney with adequate draft that meets all local codes and regulations and be in
accordance with CSA B149.1 or NFPA 54 whichever applicable. Always inspect and clean the
chimney to insure that it is free from obstructions. Never connect the boiler to a chimney or
liner serving an open fireplace.
A 6” diameter flue pipe must be used for connection of the boiler flue outlet to the
chimney for the entire length of the connection. An exception can be made for the three,
four and five section boilers where the flue pipe may be reduced to 5” for the length of the
connection. The chimney connector should be at least 24 gauge metal, be properly supported
and be free of as many 90 degree turns as possible. The distance between the boiler and the
chimney depends on whether or not elbows are used. The distance should be at least 24” if no
elbows are used and 12” if elbows are used. The maximum length of the flue pipe. It must be
no longer than 10’ if no elbows are used and 6’ if elbows are used.
Draft Regulator
GasFired units: A double acting draft regulator must be installed on
the flue
pipe
.