Clear Space; Over Firing; Firebox Break-In - Monessen Hearth BUF32A Owner's Manual

improper installation or operation, can settle on surfaces
outside the firebox. See log placement instructions for
proper installation.
8. Avoid any drafts that alter burner flame patterns. Do
not allow fans to blow directly into firebox. Do not place
a blower inside burn area of firebox. Ceiling fans may
create drafts that alter burner flame patterns. Sooting
and improper burning will occur.
9. CAUTION: Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appli-
ances will not filter or clean soot produced by these types
of products. In addition, the smoke and/or aromatics
(scents) may be re-burnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appli-
ance is in operation.
10. An unvented gas-fired heater uses air (oxygen) from
the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. See
installation guidelines.
11. Keep room area clear and free from combustible materi-
als, gasoline and other flammable vapors and liquids.
12. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appliance.
13. Unvented gas heaters emit moisture into the living area.
In most homes of average construction, this does not
pose a problem. In houses of extremely tight construc-
tion, additional mechanical ventilation is recommended.
14. During manufacturing, fabricating and shipping, vari-
ous components of this firebox are treated with certain
oils, films or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation of the
firebox; possibly causing headaches, or eye or lung
irritation. This is a normal and temporary occurrence.
The initial break-in operation should last two to three
hours with the burner at the highest setting. Provide
maximum ventilation by opening windows or doors to
allow odors to dissipate. Any odors remaining after this
initial break-in period will be slight and will disappear
with continued use.
15. Do not use this room heater if any part has been under
water. Immediately call a qualified service technician
to inspect the room heater and to replace any part of
the control system and any gas control which has been
under water.
16. Never burn solid fuels in a firebox where a unvented
room heater is installed.
17. Always have a firebox screen in place when the appli-
ance is in operation, and unless other provisions for
combustion air are provided, the screen shall have an
opening(s) for induction of combustion air.
8
Monessen • BUF32/36/42 Owner's Manual • 4139-900 • Rev A • 01/21
B. Clear Space
WARNING! DO NOT place combustible objects in front
of the firebox. High temperatures could start a fire. See
Figure 3.1.
Avoid placing candles and other heat-sensitive objects
on mantel or hearth. Heat could damage these objects.

CLEAR SPACE

FRONT OF
FIREBOX
Figure 3.1 Clear Space Requirement - All Models
C. Over Firing
The firebox is considered to be over firing if the flames are
higher than the firebox opening. Call a qualified service
technician to service the firebox.
D. Firebox Break-In
Initial Break-in Procedure
• The firebox should be run three to four hours continuously.
• Turn the firebox off and allow it to completely cool.
This cures the materials used to manufacture the firebox.
NOTICE! Open windows for air circulation during

firebox break-in.

• Some people may be sensitive to smoke and odors.
• Smoke detectors may activate.
3 FT. IN