Page 35
Installation and Operation Manual - Osburn 3500
8.2.2 Masonry Flue System
The wood fire may also be connected to a masonry
flue system, provided the flue system complies with
AS/NZS 2918 or with the construction rules found in
the building code enforced locally. The flue system
must have either a clay liner or a suitably listed
stainless steel liner. If the masonry flue system has
a square or rectangular liner that is larger in cross
sectional area than a round 150 mm (6“) flue, it
should be relined with a suitably listed 150 mm (6“)
stainless steel liner. Do not downsize the flue to less
than 150 mm (6“) unless the flue system is straight
and exceeds 8 m (25 feet) in height. When passing
through a combustible wall, the use of an insulated
listed thimble is required.
8.3 Minimum Flue Height
Flue heights and lengths from AS/NZS 2918:2001
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