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"MOJO" Series Unvented Gas Log Sets
WARNING!
The dimensions shown in Figures 3 through
11 and defined in the fireplace manufacturer's
instructions are minimum clearances to
maintain when installing this heater. Left and
right clearances are determined when facing
the front of the heater.
When heater is installed into an unvented
firebox, minimum clearances, as specified by
the unvented firebox manufacturer, must be met.
Follow these instructions carefully to ensure
safe installation. Failure to follow instructions
exactly can create a fire hazard.
Sidewall and ceiling clearances: The sides of the fire-
place opening must be at least 16" from any combustible
wall� The ceiling must be at least 42" from the top of the
fireplace opening.
16"
Figure 3. Sidewall and Ceiling Clearances
FP1996
wall ceiling clearances
Monessen • MJ27NR-S/MJ27PR-S Owner's Manual • 20308677 • Rev B • 01/17
42"
FP1996
CLEARANCES and HEIGHT REQUIREMENTS
Heat resistant material (minimum requirements) with
no wooden mantel or other combustible projection:
To install the gas logs into a fireplace with no wooden
mantel, shelf or other combustible projection above the
fireplace opening, measure the heat resistant material
height according to Figure 4, then see TABLE A�
Heat resistant materials such as slate and marble must be
at least 1/2" thick. Sheet metal should not be installed
onto combustible material.
Heat Resistant
Material
Figure 4. Measuring Heat Resistant Material
FP1997
heat resistant material
TABLE A –
Heat Resistant Material Requirements with no Mantel
or Combustible Projection
Heat Resistant
Material Measurement
12" or more
Between 8" and12"
Less than 8"
Measure
This
Distance
Heater in Fireplace or
Firebox
FP1997
Requirements for Safe Installation
MJ27
Hood not required
Extend heat resistant material to 12"
OR install hood� *Figure 5*
Extend heat resistant material to at
least 8" AND install hood� *Figure 5*
OR, extend heat resistant material to
a height of at least 12"
7
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