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624WBPF Woodburning Fireplace
53D9052
When an AK4 combustion air assembly and a combustion air duct are attached to the connecting
point on the left or right side of the fireplace, combustion air may enter the firebox through a dam-
pered opening behind the left or right side brick. This feature is designed for your benefit to reduce
the room air used for combustion 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 left and right side of the firebox near the top of the firebrick, 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 fireplace allows the routing of the combustion air duct up, down, or horizontally to
obtain the outside combustion air. This permits flexibility in planning your installation. Refer to Page
18 for typical installation methods. Review the precautions and recommendations in this manual
pertaining to outside combustion air installation.
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 from entering the chimney as well as
preventing warm air in the room from escaping up the chimney.
: It is normal for a small amount of smoke to be released from the upper portion of the fire-
place 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.
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 flame may be drawn out of the fireplace
opening, creating risks of both fire and smoke.
All fireplace chimneys are in direct contact with cold air on the exterior of the structure. Conse-
quently, when the fireplace is not in use, cold air can fall down the chimney of the fireplace to cool
off the fireplace 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 fireplace 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 con-
sumed 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 from 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.