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No damper, heat saver, or automat-
ic vent damper device should be
installed in or on the smoke pipe.
NO OTHER A P P L I A N C E S
SHOULD BE VENTED TO THIS FLUE!
CAUTION: THE CHIMNEY MUST
BE A CLASS “A” CHIMNEY IN GOOD
OPERATION CONDITION.
NOTE: THE USE OF ALUMINUM
TYPE “B” GAS VENT FOR SOLID
FUELS IS UNSAFE AND PROHIBIT-
ED BY THE NATIONAL FIRE PRO-
TECTION ASSOCIATION CODE.
There are three types of Class “A”
chimneys:
A. Masonry with tile liner to
include brick or stone. It must be
supported on grade level founda-
tion.
B. Insulated Class “A” manufac-
tured chimney, listed or certified by
a national test agency.
C. Triple Wall Metal Class “A”
chimney, listed or certified by a
national test agency.
If your masonry chimney has not
been used for some time, have it
inspected by a qualified person (build-
ing inspector, fire department person-
nel, etc.) If a listed or certified manu-
factured chimney is to be used, make
certain it is installed in accordance with
the manufacturer’s instructions and all
local and state codes. See Figure No. 1
of Manufactured Chimney Installation
and Figure No. 2 of Masonry Chimney
(note roof clearance in accordance with
NFPA 211.)
3.2 Common Chimney Problems
In order to have a proper operating
solid fuel heating system, the chimney
must be capable of providing the draft
required.
The minimum required draft is .06
inches W.C. (water column). This must
be measured using a draft gauge.
If the chimney cannot supply this
constant draft, the unit will not operate
properly.
In some installations, a barometric
draft regulator may be used and prop-
erly adjusted to compensate for exces-
sive draft.
IMPORTANT!
Whenever you measure the draft,
the stove must be operating and suffi-
cient time given for the chimney and
stove to warm up. This should take a
minimum of thirty minutes.
The draft reading is taken 18" up
from the center of the stove flue outlet
in the smoke pipe.
REASONS for insufficient draft read-
ings:
A. Leaky Chimney - Air leaking in
around a loose fitting cleanout door,
flue pipes not tight at the joints, improp-
er plug openings or defective masonry.
B. Chimney Improper Height - Chim-
ney does not extend through the roof
to a sufficient height to promote suffi-
cient draft or causes a down drafting
condition to take place. (See Figure
No. 3).
C. Obstructions in the chimney.
Check prior to using by holding a mirror
in chimney clean-out door. This will
give a view of the chimney.
D. Trees or Other To p o g r a p h i c a l
Barriers - Impeding the chimneys oper-
ation or causing a down draft condition
to exist. This can also be caused by
adjacent buildings or the roof of the
same structure where the chimney is
not high enough (See Figure no. 3).
Figure 3
NOTE: The Chimney on the house
illustrated is too low. It should be raised
to compensate for drafts.
E. Chimney Size - Chimney is not
properly sized to adequately vent the
appliance. It is either too small or too
large.
F. Chimney Offsets - Chimneys with
offsets should not be used. They cause
an obstruction to draft as well as a
place for debris to collect.
G. Elbow Restrictions - The flue pipe
is connected to the chimney with too
many elbows, reducing the draft the
chimney can provide.