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Prefabricated Chimneys
If a prefabricated metal chimney is to be used it
must be a chimney type that is tested and listed for
use with solid fuel burning appliances. High
Temperature (HT) Chimney Standard UL 103 for
the U.S. and High Temperature Standard ULC
S-629 for Canada.
Masonry Chimneys
When installing the OSLO F500 into a masonry
chimney you must conform to all of the following
guidelines:
· The masonry chimney must have a fireclay liner
or equivalent, with a minimum thickness of
5/8 and must be installed with refractory mortar.
There must be at least ½ air space between
the flue liner and chimney wall.
· The fireclay flue liner must have a nominal size
of 8 X 8, and should not be larger than
8X 12. If a round fireclay liner is to be used it
must have a minimum inside diameter of 6 and
not larger than 8 in diameter. If a chimney with
larger dimensions is to be used, it should be
relined with an appropriate liner that is code
approved.
· The masonry wall of the chimney, if brick or
modular block, must be a minimum of 4 nominal
thickness. A mountain or rubble stone wall must
be at least 12 thick.
· A newly-built chimney must conform to local
codes and in their absence must recognize
national regulations.
· When using an existing chimney, it must be
inspected by a professional licensed chimney
sweep, fire official, or code officer, to ensure
that the chimney is in proper working order.
· No other appliance can be vented into the same
flue.
· An airtight clean-out door should be located at
the base of the chimney.
5
CHIMNEY REQUIREMENTS
There are two types of chimneys suitable for the
OSLO F500:
1. A code- approved masonry chimney with a flue
liner.
2. A prefabricated chimney complying with the
requirements for Type HT (2100°F) chimneys
per UL 103 or ULC S629.
The chimney size should not be less than the cross-
sectional area of the flue collar, and not more than
three times greater than the cross-sectional area of
the flue collar.
When selecting a chimney type and the location for
the chimney in the house, keep this in mind: it is the
chimney that makes the stove work, NOT the stove
that makes the chimney work. This is because a
chimney actually creates a suction, called draft
which pulls air through the stove.
Several factors affect draft: chimney height, cross-
sectional area (size), and temperature of the chimney,
as well as the proximity of surrounding trees or
buildings.
As a result, a short masonry chimney on the exterior
of a house will give the poorest performance. This
is because it can be very difficult to warm the
chimney thereby creating inadequate draft. In
extremely cold northern areas it may be necessary
to reline the chimney or extend its height to help
establish draft.
Oppositely, a tall masonry chimney inside the house
is easier to keep warm and will perform the best.
The following guidelines give the necessary chimney
requirements based on the national code (ANSI-
NFPA 211for the US. And CSA CAN-B365 for
Canada). However, many local codes differ from
the national code to take into account climate,
altitude, or other factors. It is important that you
check with your local building officials to find out
what codes apply in your area before installing your
new OSLO F500.