2
If the chimney must go through a combustible
wall, be sure to use a metal thimble specially
designed for this purpose. The proper way to
install a thimble is to cut an oversize hole in the
sheetrock about 6 or 7 inches larger than the
thimble. However, be sure to follow the
manufacturer’s directions that come with the
thimble. A metal ring shield is used to cover
the hole. This way air can circulate and cool
the area around the passageway.
Technical Aspects
of Chimney Performance
A device called a manometer is used in
describing the technical performance of a
chimney. A manometer is an instrument used
for measuring the pressure of liquids and gases.
An analog manometer consists of a glass tube
filled with a liquid and mounted in front of a
measuring scale against which the liquid level
can be measured. If a manometer were
connected to a leak-free chimney with a leak-
free connection, then the draft in the chimney
should exert enough pressure (or pull) against
the water in the manometer to cause it to move
at least 0.04 inches in the tube.
CAUTION:
SUFFOCATION HAZARD
The airflow through the
system and out the chimney
means that oxygen is leaving
the home and will create an
oxygen deficit if this air is
not replaced.
The airflow through the system and out the
chimney means that oxygen is leaving the
home and will create an oxygen deficit if this
air is not replaced. There is usually sufficient
leakage in older homes, but in well-insulated
homes it may be necessary to provide
additional outside air into the home.
STOVEPIPE
Use only 22-24 gauge single wall stove pipe in
open areas no closer than 18 inches from walls
or ceiling. If the stovepipe must be closer than
18 inches from the nearest wall or ceiling, or if
it must go through walls, closets, or boxed in
areas, then U.L. listed insulated stovepipe must
be used. Pipe that runs along the outside walls
of a building must also be U.L. listed insulated
pipe, even if it runs along a non-combustible
outside wall. This requirement is in place in
order to prevent cooling of the stovepipe which
in turn cools the rising smoke and causes
creosote to form quickly.
It is not advisable to connect more than one
heating appliance to a single chimney but if it is
necessary, connect one above the other rather
than at the same level. One will rob the other
of draft pull and neither will operate properly if
installed at the same level.
PROPER CHIMNEY CONNECTION
The boiler must be connected to a
class”A”
chimney with 18 gauge smoke pipe preferably
stainless steel.
WARNING:
CODE COMPLIANCE
Use of aluminum Type B gas
vent for solid fuels is unsafe
and prohibited by the National
Fire Protection Association
Code.
Use of aluminum Type B gas vent for solid
fuels is unsafe and prohibited by the National
Fire Protection Association Code. The
recommended method for connecting the boiler
to the chimney is to place a T-joint at the top of
the vertical section leading from the cyclone.
The rear opening must be covered with a cap,
which can be removed for cleaning and
inspection. If the horizontal run to the chimney
is inclined, it will encourage any fly ash, which
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