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53D9041
B36LA & B36RA Woodburning Fireplaces
OPERATION GUIDELINES
As wood is burned in the fireplace, room air enters the air slot on the lower front edge and circulates
around the firebox.
The air circulation around the firebox serves to cool the fireplace and must not be blocked in any man-
ner. Blocking of the inlet slot or outlet louver will cause the firebox to reach hazardous temperatures.
When an OAC4 combustion air assembly and a combustion air duct are attached to the connecting
point on the left of the fireplace, combustion air may enter the firebox through a dampered opening
behind the side panel. This feature is designed for your benefit to reduce the room air used for com-
bustion and to prevent excessive loss of heat from the room. When the fireplace is in use, this damper
should be open. When the fireplace is not in use, the damper should be closed to prevent cold air from
entering the firebox. The combustion air damper is open when the lever, located on the side of the
firebox 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.
Glass doors should be installed to receive the maximum benefit from your fireplace. For large fires, the
maximum heating benefit from the fireplace will be obtained with the doors open due to the high amount
of radiant heat being emitted out of the front opening of the fireplace. With a small fire, or before retiring
in the evenings, it is best to operate the fireplace with the doors closed to prevent excessive room air
form being drawn up the chimney. When the doors are open, the mesh screens should be closed to
help keep burning embers from popping out of the firebox.
The unique design of the fireplace allows the routing of the combustion air duct downward, horizontally
or upward to obtain the outside combustion air. This permits maximum flexibility in planning your instal-
lation. Refer to
Page 22, Figure 24
for typical installation methods. Be sure to review the precautions
and recommendations in the section of this manual pertaining to outside combustion air assembly.
The fireplace is also equipped with a flue damper, which must be open when the fireplace is in use. The
flue damper control lever is located inside the fireplace. The counterweighted damper is operated by
simply pushing up to open or pulling down to close the damper. When the fireplace is not in use, the
damper should be closed to prevent cold air form 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 released from the upper portion of the fireplace
the first few times you use your new fireplace. This results from an oil residue on the metal. Open a
door or window to allow the smoke to escape.
WARNING:
Fireplaces equipped with glass doors should be operated only with the doors fully open or
doors fully closed. If doors are left partly open, gas and flame may be drawn out of the fireplace open-
ing, creating risks of both fire and smoke.
All fireplace chimneys are in direct contact with cold air on the exterior of the structure. Consequently,
when the fireplace is not in use, cold air can fall down the chimney of the fireplace to cool off the fire-
place chase. Therefore, the fireplace chase must be insulated to minimize the risk of cold air infiltration
to the home. Even if the fireplace chase is adequately insulated, this cannot completely ensure that
cold air infiltration into the structure will be eliminated. Cold air infiltration is a possibility with any fire-
place or device that freely communicates with the air on the outside of the structure. Today’s homes are
more energy-efficient 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. Unless the additional air is supplied, this can cause a negative pressure
in the home. When this happens, the house will draw in outside air form the cracks in the windows,
down the fireplace flue or other locations of air leakage in the home. Because cold air infiltration may
be unavoidable in some structures, MHSC is not responsible for heat loss or air infiltration through or
around the fireplace.
