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01/04 4039-150 Rev B 17
MONTANA INSTALLATION INSTRUCTIONS
Note: Use only a noncombustible material to finish
the face of the fireplace below the level of the front
standoffs. A noncombustible material such as USG
MICORE CV230 Mineral Fiber Board, or USG
DUROCK Cement Board is recommended for this
purpose.
Figure 20 - Air Clearance Around Gas Line
12. Complete the Enclosure
Complete the fireplace enclosure, allowing space for outside
air ducts and gas piping if desired. Electrical wiring should
not come in contact with the fireplace. A minimum clearance
of 1½ must be maintained between the fireplace sides
and the enclosure as well as the fireplace back and the
enclosure. See pages 8 and 9 for framing details.
CAUTION:
When using a gas log set, the fireplace damper
must be set in the fully open position. This en-
sures proper venting of combustion products.
WARNING!
This fireplace was not tested by the fireplace
manufacturer for use with an unvented gas log
heater. To reduce risk of injury, do not install an
unvented gas log heater in this fireplace unless
it has been specifically tested and listed by
Underwriters Laboratories Inc. for use in this
specific model fireplace. Unless the unvented gas
log heater is tested and listed for use in this fac-
tory built fireplace, a fire hazard may be created
that can result in a structure fire.
13. Gas Log/Lighter Provisions
Knockouts are provided on both sides of the fireplace to allow
for connection of a certified gas log lighter or a decorative
gas appliance certified or tested for outdoor use, with a
maximum input of 100,000 BTU/hour, incorporating an
automatic gas shut-off device and complying with the
Standard for Decorative Gas Appliances for Installation
in Vented Fireplaces, ANSI Z21.60. The decorative gas
appliance should be installed in accordance with the National
Fuel Gas Code, ANSI Z223.1-1980. The side refractories are
designed to allow ½ iron pipe to pass through. Use a
noncombustible sealant to seal any opening between the gas
pipe and refractory on the inside. Repack the insulation
removed to seal around the gas pipe where it exits the side of
the fireplace. A minimum 1½ air clearance must be provided
around the ½ iron pipe for a minimum of 4 inches beyond
the fireplace. See Figure 20.
CLEARANCES!
A minimum 1½ air clearance must be maintained
at the back and sides of the fireplace assembly ex-
cept at the nailing flange where the clearance is ½.
Chimney sections at any level require a 2 minimum
air space clearance between the framing and chim-
ney section.