Osburn 900 Installation and Operation Manual
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The rules below are based on those found in the CSA B365 installation code. Please carefully follow
these installation instruction rules, or those enforced where you live.
•
Maximum overall length of straight 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° elbows is often preferable to a single 90° elbow because less turbulence is created in
the exhaust flow and they result in less horizontal run.
•
Maximum number of 90° 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.)
•
Each joint in the assembly must be fastened with at least three screws.
•
The assembly must have allowance for expansion: elbows in assemblies allow for expansion;
straight assemblies should include an inspection wrap with one end unfastened, or a telescopic
section.
•
Minimum upward slope towards the chimney: 20 mm/m (1/4 in/ft.).
•
One end of the assembly must be securely fastened to the flue collar with 3 sheet metal screws
and the other end securely fastened to the chimney.
•
There must be provision for cleaning of the pipes, either through a clean out or by removal of
the pipe assembly. Removal of the assembly should not require that the stove be moved.
•
The male ends of the sections must be oriented towards the appliance so that falling dust and
condensation stay inside the pipe.
•
A flue pipe must never pass through a combustible floor or ceiling or through an attic, roof space,
closet or concealed space.
•
Where passage through a wall or partition of combustible construction is desired, the
installation shall conform to CAN/CSA-B365, Installation Code for Solid-Fuel-Burning Appliances
and Equipment.
The ideal flue pipe assembly is one that rises straight up from the appliance flue collar and directly
into the chimney with no elbows. A straight up connector assembly needs either a telescopic length
or an inspection wrap (pipe coupler) to allow it to be assembled and disassembled without moving
the stove.
A straight flue pipe assembly offers the least restriction to gas flow and results in stronger draft.
Straight assemblies also need less maintenance because there are no corners to collect creosote.
The chimney connector must be in good condition.
