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3 3
Clearances and Height Requirements
WARNING
The dimensions shown in Figures 3.1 through
3.8 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 a ventless firebox,
minimum clearances, as specified by the ventless
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.. See Figure 3.1.
16"
Figure 3.1 - Sidewall and Ceiling Clearances
Table A — Non-Combustible Material Requirements with No Mantel or Combustible Projection
Non-Combustible
Material Measurement
12" or more
8" or less than 12"
Less than 8"
42"
MJ22
Hood not required
Hood not required
Extend non-
combustible material
to 8" AND install hood.
Figure 3.3
Monessen • Mojo Installation/Owner's Manual • 4623-900 Rev. F • 01/23
Non-combustible 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 non-combustible material
height, according to Figure 3.2 and TABLE A.
Non-combustible materials such as slate and marble
must be at least 1/2" thick. Sheet metal should not be
installed onto combustible material.
IMPORTANT: If you cannot meet these minimum clear-
ances you must operate the heater with chimney flue
damper open. Refer to "Vented Applications Installations"
found on page 13.
Figure 3.2 - Measure Non-Combustible Material
Requirements for Safe Installation
Hood not required
Extend non-combustible material to 12" or install hood. Figure 3.6
Extend non-combustible material to 8" AND install hood Figure 3.5.
OR Extend non-combustible material to a height of at least 12".
Figure 3.6
Non-
combustible
Material
Measure
This
Distance
Heater in
Fireplace/
Firebox
FP2254
measure heat resist
MJ27
9
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