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4
87D0174
SSTB11 Woodburning Fireplace
OPERATION GUIDELINES
As wood is burned in this replace, room air enters the
side vents of the SSTB11 and circulates around the re-
box. This air circulation cools the rebox and must not be
blocked or restricted in any manner. Blocking the airow
can cause a re hazard.
When an AK4 combustion air assembly and a combus-
tion air duct are attached to the connecting point on the
left or right side of the replace, combustion air may enter
the rebox through a dampered opening behind the left or
right side brick. This feature is designed for your benet
to reduce the room air used for combustion and to prevent
excessive loss of heat from the room. When the replace
is in use, this damper should be open. When the replace
is not in use, the damper should be closed to prevent cold
air from entering the rebox. The combustion air damper
is open when the lever, located on the left and right side
of the rebox near the top of the rebrick, is up and closed
when the lever is down.
Outside air for combustion is optional unless required by
federal, state or local building codes. See the section of
this manual providing the instructions for installation of
the combustion air assembly. The design of the replace
allows the routing of the combustion air duct up, down, or
horizontally to obtain the outside combustion air. This per-
mits exibility in planning your installation. Refer to Page
19, Figures 24 & 25 for typical installation methods. Re-
view the precautions and recommendations in this manu-
al pertaining to outside combustion air installation.
The replace is also equipped with a ue damper, which
must be open when the replace is in use. The ue
damper control lever is located inside the replace. The
counterweighted damper is operated by simply pushing
up to open or pulling down to close the damper. When
the replace is not in use, the damper should be closed
to prevent cold air from entering the chimney as well as
preventing warm air in the room from escaping up the
chimney.
NOTE: It is normal for a small amount of smoke to be re-
leased from the upper portion of the replace the rst few
times you use your new replace. This results from an oil
residue on the metal. Open a door or window to allow the
smoke to escape.
The grate included with this replace helps to appropri-
ately locate and contain the burning wood. Failure to use
this grate may cause overheating of parts of the replace
and allow large pieces of burning wood to roll forward out
of the rebox. If the grate becomes warped or damaged, it
must be replaced with grate number 07954 only.
WARNING: Fireplaces equipped with doors should be
operated only with the doors fully open or doors fully
closed. If doors are left partly open, gas and ame may
be drawn out of the replace opening, creating risks of
both re and smoke.
All replace chimneys are in direct contact with cold air
on the exterior of the structure. Consequently, when the
replace is not in use, cold air can fall down the chimney
of the replace to cool off the replace chase. Therefore,
the replace chase must be insulated to minimize the risk
of cold air inltration to the home. Even if the replace
chase is adequately insulated, this cannot completely
ensure that cold air inltration into the structure will be
eliminated. Cold air inltration is a possibility with any
replace or device that freely communicates with the air
on the outside of the structure. Today’s homes are more
energy-efcient and, therefore, better insulated and tightly
constructed. Unfortunately, when air is removed from the
house, as by a bathroom fan, or consumed by a furnace,
additional air is needed to replace the air consumed. Un-
less the additional air is supplied, this can cause a nega-
tive pressure in the home. When this happens, the house
will draw in outside air from the cracks in the windows,
down the replace ue or other locations of air leakage in
the home. Because cold air inltration may be unavoid-
able in some structures, MHSC is not responsible for heat
loss or air inltration through or around the replace.
WARNING: Due to the fact this replace has two (2)
openings, it is more susceptible to the adverse effects
of drafts or pressure changes in the room or rooms
it serves. The replace should be operated with both
sets of doors closed to prevent smoke or ame spill-
age out of the replace openings caused by drafts or
pressure changes. The door should only be opened
during the very brief period to add wood to the re or
to remove ashes. Refer to Page 25, Figure 31
The Problem
Depressurization (negative pressure) is caused by the
interaction of air where small differences in air pressure
between indoors and outdoors (pressure differentials)
amounting to no more than .0001 atmosphere creates a
‘stack effect’ - the tendency for air to rise whenever it is
warmer than the surrounding atmosphere.
The stack effect is the working principle of all chimney
systems. Heated ue gases rise up the chimney and vent
into the atmosphere pulling cooler air behind it to ll the
void. Therefore, when the air is warmer indoors than out-
doors, air tends to ow in through the lower part of the
structure and out through the upper part. Air turnover is
accomplished by inltration through various openings and
in particular around windows and doors, penetrations cre-
ated for pipes and wiring as well as replaces, water heat-
ers and furnace ue pipes. If a person would measure the
ow of air inside a typical home, he would be amazed at
the amount of movement that occurs even though the
condition is not generally noticeable.
Based on the ‘stack principle’, the house itself acts as if it
were a short, fat chimney with air moving from the bottom
of the structure to the top.
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